KD-AVX2 head unit powers on for up to 60 seconds & reboots repeatedly

I have 2 kd-avx2 head units. One of them has devloped a symptom were when hooked up in the car or on the bench it will power on for anywhere from 20 seconds to a minute. It will then seem to shut down briefly and then come back on, repeating this cycle over & over. Swapped lower system board units between the two avx2s and the problem is definately on the system board somewhere. Any ideas as to what component(s) would cause this failure mode ? Also how long does JVC service usually take to turn around a repair like this ?

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