I had those issues on a VPS I rented from Vultr. It's not really powerfull, like 1 CPU and 1 GB of RAM. The RAM is really the bottleneck here.

Anyway, the problem solved itself so you don't hear me complaining anymore

Been running stable for over 24 hours now.

Another question: Let's say I have quite a few Opal's, over 80k. Do I have to use coin control in order to get the maxium stake rewards? If yes, how do I use this?

Thanks for the help