Electrical Questions? Ask an Electrician Online.
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If your electrician didn't find anything then it should be safe. There's no way I can diagnose a one off occurance from here.
Like I said before there's no way I can diagnose a 1 time occurance from behind a computer screen miles from where you are. You had an electrician check it out and he didn't find a problem so there's not much more you can do short of tearing the wall open on the chance you might find something.
There's no way I can tell from here. You haven't given me any info that would point to a cause.