tuxduino:
Have you tried plugging the equipment into a different wall socket ? Maybe the "monitoring" power line (or that specific socket) can't handle the temporary load increase you have when plugging the equipment, so the voltage momentarily drops, making the usb charger drop the power to the arduino long enough to have it reset.
just my 2 cents.
Hello. We have many of the same exact devices plugged into many different wall sockets. I think what you are saying is the exact problem. It makes the voltage jump down and back up, causing the arduino to go haywire. The weird thing is that it completely messes up the instruction cycle. Im guessing even the memory containing instruction location is also getting corrupted. Its weird because i would guess the watchdog timer would still work, but it does not.