If your microwave is now on a 20-amp breaker, and if there is another, identical 20-amp breaker in your box, you can do some problem determination by swapping the 2 breakers (or swap the hot wires on them). Make sure power is off first.
Which one fails now? Is it the breaker or something on the circuit that's causing the problem?
(As Electricmanscott said, the wrong size wire won't cause a breaker to trip.)
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