I have just swapped the wireless board. I didn't see any damages on the board, but there was some dust collecting. I am going to test the wireless for around a week before deciding whether swapping fixed my problem
We were having router problems before, but then we upgraded to wireless N and havnt had any problems with any devices ever since. I always get full bars of signal too
Swapping the wireless boards was free, because I have a spare ps3 that is broken and can be used for parts
Also, if it was a router problem, why does the wifi stop working when i tether it to my laptop?