Thanks for informing us and sorry for the inconvenience it has caused.
Now I will provide some information for those who are interested in knowing the cause.
This issue happened to a few number of clients having Master Slider 3.3.0 and Object cache enabled on their web server.
Most of plugins and themes (including Master Slider) use transient API for caching the remote or expensive process and rely on the cache data for a period of time. The problem is that while object cache is enabled on a web server, the cache will be stored in memory instead of the disk. As a result, depending on website traffic, the memory cache might be flushed earlier than expected expiration period or in such cases due to poor configurations on web server, the memory cache might be flushed after few seconds! Consequently, the above-mentioned processes will be triggered sooner and over and over again, which cause a lot more HTTP requests by the server to other services in the background.
So those who had this issue with Master Slider, be aware of this problem on your web server.
The quickest solutions for those who are using W3 Total Cache plugin is navigating to Performance > Object Cache
menu under the admin menu and enabling the Store transients in database
option.
Good luck