I have 4 GFCI plugs on the kitchen wall that have been there for a few years. Late afternoon yesterday, all 4 tripped. I kept resetting them and they kept tripping. 2 are on 1 breaker and 2 on another. I replaced 1 late last evening and all was well today. About the same time it happened again. The wall faces west and we are having record heat. The afternoon sun shines on the wall. Can that be causing the problem?