Thing is i'm sure this sky router must be on auto or summat other wise why would i have to change channels every day?
I went through a phase of having to change channels on mine when the local IT guru got his broadband (Sky funnily enough).
A few days of pissing about with the limited crap that O2 supply soon saw me replacing it with something slightly better, then flashing it with a new firmware so I could push the wi-fi transmit power up to a sensible level rather than rely on the crap nanny says is good for us, as well as put it on a channel not available in the UK.
Not fit for purpose then! You shouldn't need to keep changing the channels every time it drops out. Phone 'em back and insist on an engineer.
If it's nothing more than the wi-fi signal from the router being obliterated by a stronger signal from elsewhere, then the "not fit for purpose" argument is out of the door.
Besides, if the router is even suspected as f*cked then O2 replace it immediately anyway.