there is a re-set button on your homehub.. you'll need a pin or pen to push it in, it's in a tiddly hole. hold it down for 10 secs and the hub will re-set.
I had to phone India for my mum a couple of weeks ago, they said "your mother (I can't do the accent, btw!) had had her hub on for over 8 weeks continuously. tell her to turn it off for a while!" so, you should be turning off your hub overnight. you don't lose anything. I switch mine off every night.
best of luck, hope you don't have to make that call!