your problem is honestly very weird!
usually you are logged out of these places when you are idle (although you say you were active, weird!), and there is usually a setting for that in settings that you can change the time of. i don't use polo so you have to look to see if it exists, turn it off it does.
also if nothing helped, try clearing your cookies, history and saved data,... and also make sure to scan your computer to see if you have any kind of malicious software, sometimes they can interfere with some stuff.
and in the end the only other option that comes to my mind is either switching to another exchange like bittrex or using a bot. you can only use it to set the trades, it is a pretty simple code to execute orders if you know anything about coding you can write one yourself too.
It has actually gotten far worse the last hour. I can barely load in order books, and i am unable to close my buy orders, open new buy orders, or make any sell orders.
It is all frozen for me. I see alot of people in the trollbox are having the same issue, but it also seems that some people are able to trade just fine.
Very weird.
I've done everything what the mods told me to, emptying my caches etcetera, but nothing has helped so far.
I really don't think it is a problem on my end..