XTS-5000 resets in loop

[RTESTP25]

I have problem Xts-5000 after storage for 8 months it goes into a loop booting after power up. After 5 minutes the display is up and if radio receives or transmits it goes into loop. I reseated all flex cables and cleaned battery contacts internal and external. I tried external 12 volt adapter battery and several Oem batteries with same problem. One time after radio woke up it worked for about 20 minutes with proper rx and tx. I did try to read and write file back to radio with same result. I turned off software Adp with same result. Any idea where to go next to fix this problem. Radio is range 1 Uhf loaded with Fpp.