What else has changed?
It could be that the background noise on the line has changed significantly and that the additional EMI/RFI from the television is enough to cause a loss of sync, OR the television has an internal problem and is causing a lot more EMI.
The EMI is probably radiated rather than conducted and a power conditioner is unlikely to make any difference.
Where does the phone line run?
Can you get the router stats for the line with television off, just after switch on and a few minutes later.
Might also be worth getting Router Stats Lite, set the sample time as low as it can go and run that whilst turning the television on and seeing how the SNR jumps around.
M H C
taurus excreta cerebrum vincit
Edited by MHC (Wed 25-Jan-12 09:11:10)