WiFi problem once a chager plugged in
 

My N900 is dropping WiFi connection as soon as I plug in the USB charger. It also fails to see any WiFi networks (just offers UMTS/GSM connections) and if it does "see" wifi and "connects" to it the link drops immediately.

Unplugging the charger doesn't do any good until a full restart.

Any guesses what it might be? Is this a know problem? I searched here but to no avail.

Thank in advance for your responses!