A friend of mine has a line from the same guy, his has not froze in about 2 months, everything else is exactly the same. Same box, same router, same internet package same connection.
Totally irrelevant.
I test lots of lines which i can get working but will not work correctly for members.
Quite often, i advise them to get the password changed and suddenly it's almost glitch free.
Remember as well that connections go stale so always a good idea to reset the box on a regular basis and router as well.