Hi.
After using Norton products for years (2003 was their best ever!), they see to have gone downhill, causing more and more problems and taking more and more resources from the PCs.
As a result, having tried 360 on 10 different PCs, we uninstalled them all and now use AVG Corporate edition. (The free version is very good if you don't want to spend money).
So, yes, your problems seem to be pretty normal with Norton. On the tecchie boards that I infest, problems with Norton come up all the time. No particular theme just lots of different problems.
Sorry.
The other thing that I HATE is that when you renew using a credit card, they now automatically take the right to charge you annually unless you go in and cancel it. Of course, that fact is not obvious and the cancellation process is not quick or easy. Seems most untrustworthy behaviour to me. So I don't trust them any more. It is getting difficult to tell the thieves from the protectors nowadays.
This laptop has Norton 2003 installed. When Norton no longer support it, I will install AVG.