Microcontroller freezes (or doesn't) when plugged into different outlets in my home
Most likely you are facing electromagnetic interference (EMI). 

It seems that your power supply has grounding pin. It also has capacitors from either mains pins to ground pin as a filter. If ground pin is not properly connected, you get half of mains voltage as common mode EMI at the output of your power supply. This causes lots of trouble with unprotected modern digital electronics.

Solution: ensure good grounding of the power supply and/or EMI filtering at load side.