Looks like backup server is working fine. I will use both from now on
From now on? You
HAVE TO ALWAYS use both servers, not only from now on. We always recommend to use both servers- main and backup in order to avoid freezing, glitching, etc.
Get your internet connection tracked when you have freezes. UPC package on Thor is working normally, and nobody but you claim only. Nobody from the users are claiming on the forum re:freezes, you may check it yourself.
Every time when you are experiencing any problem, get log-file and provide it here. Without log-file, nobody will be able to help you.
Also, look at the forum. If you don't see any posts related to your problem, it means that the problem is on your side and you have to check your internet connection, receiver settings, etc. Enter the billing and compare the settings provided there with those available in your receiver.