I was wondering if you could help me with a problem I'm having with some Linux servers. I've been using them for years and have never had this issue before, but recently something changed. What happens is that every few days, one of the servers just stops responding to requests. The other servers are unaffected, and there are no errors in the logs. When it happens, I can't connect to any of the services on that server anymore.I've tried rebooting and restarting but it doesn't fix the problem. What should I do?