At which point, any post being worked on is gone. I see this a lot, typically if I'm logged in but not doing anything active. I can ignore it then but when it wipes out a post someone is working on, it's more of a problem.
Is it a setting in XenForo I can adjust? A setting on my web hosting side that I can adjust?
Other than tell Network Solutions what the XenForo error message says, I don't know what specifics to tell them. Is there some way to see what XenForo was doing that resulted in the XenForo error message?