RobbieK

I don't really know how to solve your problem here, although a server admin/dev might have the ability to turn this off for their server. Check to see if it is on multiple servers, even ones that you don't play on. Also, it may be because a common 3rd party script that servers commonly use is malfunctioning.

maybe it is because the key "E" is somehow still binded so that it closes the left/right panel, but will no longer open in. Try setting your controls to default and see if it works

I guess it is just a problem of how long your gpu/cpu can run without overheating, also, check if the fans are working, or if your computer is liquid cooled, then check to see if that is working