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What zm version is this?
4.5 and 5Quote
Disconnects are very regular.
Yes they appear regular, however disconnects only happen when zm is running. Otherwise the computers do not disconnect. I tested this by only running zm in one GPU miner while the others where doing other miners and only the box with zm disconnected.Quote
Is there anything that happens every hour on your host/network?
Not that I am aware of.Quote
It's very strange that it happens exactly after one hour but works fine 1 hour long.
It's approximately one hour and it starts counting at the time zm starts running. I don't see any memory leaks. It seems a lot like a build up of connections not being cleaned until network crashes.Quote
Other users seem not to have this issues.
This is puzzling, sure, I do have 3 boxes with the same behavior. I'll go ahead and see if I can reproduce this behavior in a freshly installed box.Quote
24 simultaneous connection is a nothing special, browsers open up to 8/16 sim. connections per website/domain.
I agree, but all the connections are closed. And most connections are to servers that are meant for multiple connections (as httpd).Quote
I'll check ofc if there is something wrong in my code.
Hard to check if we can't pinpoint where to look.Quote
Could you pls. pm me some logfiles?
Sure, what logs do you need?Quote
Btw. zm looks faster on pool side 
It most definitively is.