yeah, probably a coincidence I've been testing all the recent versions with 1k+ clients (even only with 200 it is crashing) and all of them crash after 3 to 10 days (in my case). In my test servers with the same versions the servers simply do not crash xD
Independent of what @kllauzs problem is with experimental_31, anyone can confirm that the latest version changes the config.yml file to unparseable numbers?