Hello! We had the outlet above the microwave go out last year!

We have honestly ignored it (ik, bad) but recently my boyfriend used it and it worked for about 4 days before it quit working again.

It turns the microwave on but doesn’t allow it to heat up or run well.

We know it’s not the microwave because we can plug it into other outlets and it’s fine.

What should I do to try and fix this issue? I am suspecting something may just be lose??

TIA!! :))