Reaching full cache every couple of hours

you should, as cache size is a canary in the coalmine. the easiest way to fix this (in 98,67% of cases) is to disable the aggregation of inline JS.

frank

Please check this post for automatic/hassle-free cache purge mechanism.

https://www.ads-software.com/support/topic/contribution-autoptimize-cache-size-under-control-by-schedule-auto-cache-purge/