Same here - NO issues with MS Edge and the MS Surface (this) Forum. Loads right up. As a fail safe you can always do a reset of your IE / Edge from the IE settings in the Control Panel. Another thing you might try is using a program like CCleaner to clean out your cookies, typed pages, etc. I have found that this will clear up various issues as well. Let us know if this or anything else fixes the issue when / if you get a moment.
You can keep Norton - and welcome yourself to the Rhelm of Slow running PC's - I won't drag out my resume, but I have been repairing, working on PC's both for the government and the private sector for 25+ years. Norton kills computers, end of discussion. Don't believe me. just do a search for something along the lines of "Does Norton Slow down PCs" and there are endless pages and stories. I understand you paid for it, by all means keep it. But you will be getting about 60% (or less) of your PC's true capabilities. In an attempt to keep your PC safe, what Norton does, is watch / control a large amount of your PC's services - additionally it eats up a good amount of RAM (256+) - and the worst part of it is - Norton doesn't really protect you. If you want decent protection, without slowing down your PC - Grab a licensed version on ZoneAlarm. - Wish you the best of luck.
If it is getting hot because of charging(and it is timely coincidence, e.g windows update installing so!Etching in the background when plugged in) then i suggest contacting Microsoft. Mine is almost always plugged in and it never gets hot as a result. Fan rarely comes on.
That means there's some process or application that is sucking up CPU power. If I make Adobe or Office work too hard, then it will cause my tablet to heat up. Usually it is caused by a background process.