Just as a point of reference, 20% fail when new out of the box. I renovate homes up north. I buy GFI outlets as the new code requires them in Kitchens and baths. 20% fail within 3 months. They are cheap and easy to replace.
If it continues, I have found grounds to be at fault. You can buy a cheap plug in tool at ACE, its lights up showing polarity and ground connection. Cost maybe 5 bucks. Should have one in the toolbox anyway. Test all your outlets.
Always eliminate simple things first.
Bud
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