Enabling object cache breaks some things

Whenever I enable object caching, sometimes I can successfully make a POST request, like saving a post, deleting a category, or updating a user information. I turned off object cache, everything works again.

Right now, I have database cache turned on, and object cache turned off. Please advise.

proxy_error_log:2017/04/04 13:59:17 [error] 18698#0: *4199222 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 209.95.50.94, server: resourcemagonline.com, request: "POST /wp-admin/user-edit.php HTTP/1.1", upstream: "https://74.208.230.151:7080/wp-admin/user-edit.php", host: "resourcemagonline.com", referrer: "https://resourcemagonline.com/wp-admin/user-edit.php?user_id=2164&wp_http_referer=%2Fwp-admin%2Fusers.php"
proxy_error_log:2017/04/04 14:26:17 [error] 18600#0: *2089 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 209.95.50.94, server: resourcemagonline.com, request: "POST /wp-admin/user-edit.php HTTP/1.1", upstream: "https://74.208.230.151:7080/wp-admin/user-edit.php", host: "resourcemagonline.com", referrer: "https://resourcemagonline.com/wp-admin/user-edit.php?user_id=2164&wp_http_referer=%2Fwp-admin%2Fusers.php"
proxy_error_log:2017/04/04 14:28:57 [error] 20399#0: *4656 upstream prematurely closed connection while reading response header from upstream, client: 209.95.50.94, server: resourcemagonline.com, request: "GET /wp-admin/plugins.php HTTP/1.1", upstream: "https://74.208.230.151:7080/wp-admin/plugins.php", host: "resourcemagonline.com", referrer: "https://resourcemagonline.com/wp-admin/plugins.php?plugin_status=all&paged=1&s"
proxy_error_log:2017/04/04 14:31:35 [error] 20805#0: *4756 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 209.95.50.94, server: resourcemagonline.com, request: "POST /wp-admin/user-edit.php HTTP/1.1", upstream: "https://74.208.230.151:7080/wp-admin/user-edit.php", host: "resourcemagonline.com", referrer: "https://resourcemagonline.com/wp-admin/user-edit.php?user_id=2164&wp_http_referer=%2Fwp-admin%2Fusers.php"
proxy_error_log:2017/04/04 14:36:02 [error] 20805#0: *7144 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 209.95.50.94, server: resourcemagonline.com, request: "POST /wp-admin/user-edit.php HTTP/1.1", upstream: "https://74.208.230.151:7080/wp-admin/user-edit.php", host: "resourcemagonline.com", referrer: "https://resourcemagonline.com/wp-admin/user-edit.php?user_id=2164&wp_http_referer=%2Fwp-admin%2Fusers.php"
proxy_error_log:2017/04/04 14:41:52 [error] 20805#0: *8968 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 209.95.50.94, server: resourcemagonline.com, request: "POST /wp-admin/user-edit.php HTTP/1.1", upstream: "https://74.208.230.151:7080/wp-admin/user-edit.php", host: "resourcemagonline.com", referrer: "https://resourcemagonline.com/wp-admin/user-edit.php?user_id=2164&wp_http_referer=%2Fwp-admin%2Fusers.php"
proxy_error_log:2017/04/04 14:45:55 [error] 20805#0: *8968 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 209.95.50.94, server: resourcemagonline.com, request: "POST /wp-admin/user-edit.php HTTP/1.1", upstream: "https://74.208.230.151:7080/wp-admin/user-edit.php", host: "resourcemagonline.com", referrer: "https://resourcemagonline.com/wp-admin/user-edit.php?user_id=2164&wp_http_referer=%2Fwp-admin%2Fusers.php"
proxy_error_log:2017/04/04 14:49:48 [error] 20805#0: *10463 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 209.95.50.94, server: resourcemagonline.com, request: "GET /wp-admin/admin.php?page=w3tc_dashboard&w3tc_flush_all&_wpnonce=654f2d2588 HTTP/1.1", upstream: "https://74.208.230.151:7080/wp-admin/admin.php?page=w3tc_dashboard&w3tc_flush_all&_wpnonce=654f2d2588", host: "resourcemagonline.com", referrer: "https://resourcemagonline.com/wp-admin/admin.php?page=w3tc_general&w3tc_message=58e3ea84674cb"
proxy_error_log:2017/04/04 14:50:20 [error] 20805#0: *12426 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 209.95.50.94, server: resourcemagonline.com, request: "POST /wp-admin/user-edit.php HTTP/1.1", upstream: "https://74.208.230.151:7080/wp-admin/user-edit.php", host: "resourcemagonline.com", referrer: "https://resourcemagonline.com/wp-admin/user-edit.php?user_id=2164&wp_http_referer=%2Fwp-admin%2Fusers.php"
proxy_error_log:2017/04/04 14:52:23 [error] 20805#0: *12426 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 209.95.50.94, server: resourcemagonline.com, request: "POST /wp-admin/admin.php?page=w3tc_general HTTP/1.1", upstream: "https://74.208.230.151:7080/wp-admin/admin.php?page=w3tc_general", host: "resourcemagonline.com", referrer: "https://resourcemagonline.com/wp-admin/admin.php?page=w3tc_general"
proxy_error_log:2017/04/04 15:02:32 [error] 20805#0: *17077 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 209.95.50.94, server: resourcemagonline.com, request: "POST /wp-admin/user-edit.php HTTP/1.1", upstream: "https://74.208.230.151:7080/wp-admin/user-edit.php", host: "resourcemagonline.com", referrer: "https://resourcemagonline.com/wp-admin/user-edit.php?user_id=2164&wp_http_referer=%2Fwp-admin%2Fusers.php"
proxy_error_log:2017/04/04 15:03:14 [error] 20805#0: *18078 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 209.95.50.94, server: resourcemagonline.com, request: "POST /wp-admin/admin.php?page=w3tc_general HTTP/1.1", upstream: "https://74.208.230.151:7080/wp-admin/admin.php?page=w3tc_general", host: "resourcemagonline.com", referrer: "https://resourcemagonline.com/wp-admin/admin.php?page=w3tc_general&w3tc_message=58e3ed6bcb892"
proxy_error_log:2017/04/04 15:06:13 [error] 20805#0: *19155 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 209.95.50.94, server: resourcemagonline.com, request: "POST /wp-admin/admin-ajax.php HTTP/1.1", upstream: "https://74.208.230.151:7080/wp-admin/admin-ajax.php", host: "resourcemagonline.com", referrer: "https://resourcemagonline.com/wp-admin/edit-tags.php?taxonomy=category"
proxy_error_log:2017/04/04 15:07:39 [error] 20805#0: *18078 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 209.95.50.94, server: resourcemagonline.com, request: "POST /wp-admin/user-edit.php HTTP/1.1", upstream: "https://74.208.230.151:7080/wp-admin/user-edit.php", host: "resourcemagonline.com", referrer: "https://resourcemagonline.com/wp-admin/user-edit.php?user_id=2164&wp_http_referer=%2Fwp-admin%2Fusers.php"
proxy_error_log:2017/04/04 15:09:02 [error] 20805#0: *18078 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 209.95.50.94, server: resourcemagonline.com, request: "POST /wp-admin/admin.php?page=w3tc_general HTTP/1.1", upstream: "https://74.208.230.151:7080/wp-admin/admin.php?page=w3tc_general", host: "resourcemagonline.com", referrer: "https://resourcemagonline.com/wp-admin/admin.php?page=w3tc_general&w3tc_message=58e3eeb20bb30"