As others suggested, try the receiver in another room and see what happens. Find out if it’s that particular outlet, if it is, try another one in the same room that should be on the same circuit. If it continues to shut down on the second outlet on the same circuit, chances are that the circuit has a ground fault or the polarity is backwards (lights and motors will still work on a 110v ass-backward circuit). If it’s located to the individual outlet, well…..then it’s the outlet, and chances are that the wireman has the polarity backwards on that particular outlet or you have a ground fault on that receptacle.
Once you determine if it is the outlet or circuit, get an electrician over there to fix it. If it's reversed polarity, that's a 20 minute fix. If it's a ground fault, that can take some time to localize the fault but the repair is usually very simple.
I wouldn’t put to much merit into coincidental electrical issues. You garage door opener issue may be related so how if it’s being feed by the same circuit, but I wouldn’t jump to conclusions just yet.
