Actually it has less to do with mAh and more to do with the quality of The voltage regulation and waveform filtration, to remove noise and RF interference.
I had the same problem while connected with charger, I tried with other chargers its fine, hope there was a problem with charger.
Also if you have problem with your PC connection, then your home power supply may not have proper GROUND . so check with Electrician.
I have experienced this with every droid device i have owned, but only when plugged into an outlet with a two prong plug... its a grounding issue that will go away with a 3 prong plug.