picture freezing

[reddabbadoo]

hi guys looking for a bit of help again please i got my arnet box working a treat but only lasted a week then all froze up and picture said bad signalor scrammbled.is this how they stop you watching.i live in chesterfield but when i search ip s only nottingham comes highlighted iv tried scanning this channel and even tried pressing red button but no luck. just put september firmware on did a factory reset before and after and re scanned all channels came up but picture freezes.i cant understand how it worked for a week them could not do it again.starting to think my box is faulty dont wont to get a new one if get same problem.could it be i need a booster or something .would be greatfull for some help close to giving up on it .....cheers dave