I am having a strange issue with a Windows Web Server 2008 R2 SP1. It's running on metal, no VM stuff here. It's a Lenovo ThinkServer server with 16 GB of RAM, Xeon, 4x Intel SSDs in RAID 5 and a 2 TB rust spinner. It worked fine since February until about a month ago when the problem started to surface, we believe after a Windows update.
What happens: the machine slowly becomes unresponsive until nothing can be done and has to be power cycled. This happens every 1 to 3 days, it never worked for more than 3 days without freezing. I checked the Windows logs, nothing out of ordinary there, except the "The system has rebooted without cleanly shutting down first" stuff.
I will describe what happened today. I see the machine frozen, so I power cycle it and install ScreenConnect. The rest of the actions are done remotely. I installed Prime 95 to see if the issue is related to the hardware. I have up Windows Task Manager. At some point, about 30 minutes after starting Prime 95, I see the CPU at 0%. I try to get into Prime 95 menus, but Prime 95 seems frozen. Task Manager was working though. Then I switch the Firefox, which seemed to be working initially, but it stopped responding within 10 - 15 seconds.
Task Manager was still fine, I was able to interact with it. Then I pressed the Start button with the mouse, nothing happens. Alt-Tab does not work as well. Task Manager is still fine at this point, but within another 10-15 seconds it does not respond as well. At this point Task Manager freezes as well, but ScreenConnect does not report a lost connection. I can move the mouse, and that's it. The local keyboard is not responsive, but the mouse of course is. The machine cannot be used, and has to be power cycled.
I had my share of blue screens and computer freezes, but never something this odd. At the moment we have provisioned another server, but I would like to know if it's a hardware or software (most likely) issue. I would like to use the server for other tasks.
Machine is frozen, but the remote connection is still up: