Ahh,That would make sense! Now that i think of it, A friend of mine had the same issues with his router
6 months both controller batt's crapped out on him? Wow!..Could have been He didn't let them charge long enough and used them, Or charged them when they weren't fully dead..OR.. just bad luck..lol.. I've had My sixxas for over 2yrs and works fine, Holds charge for countless hours, Just got a Dualshock 3 a few months ago to, no issues.
But true, once the batt craps out Your buy a whole new controller!
ORIGINAL: proanti1
I had the same problem with mine, it turned out to be a wireless router that also broadcast on the same channel as the controllers. Started happening the same day I picked up a wireless N linksys router. I just got into the routers settings and changed it to from channel 1 to channel 5, seemed to fix it. There is no sensor, the controllers have an RF radio in them which communicates with the consoles RF radio.
Edit: saw that ps3 comment... have fun once the battery in the controller goes bad. A friend of mine had to replace both his controllers after about 6 months because they wouldn't hold a charger longer than about an hour, and you cant replace the batteries.