Not sure if this is still a glitch (and couldn’t find the thread where auto-log offs had happened to others) but I had a tab open to HO on my work computer (Dell/Windows) that I hadn’t touched in about 5 minutes, and when I came back to it at 2:59 p.m. EDT, I was told I was logged off.
No biggie logging back on (once I remembered my password; but found it odd that I was logged off by the forum software.