S9i one board doesnt work

Hi there,

one of my S9i units' boards doesnt work, temp constantly stays at 15. However sometimes after a couple of hours, that one board randomly starts working again. Same process repeats if unit is rebooted.

I am running latest S9i firmware, for some reason I cant downgrade firmware anymore to test. I have tried resetting as well.

I have also tried changing ethernet cables, or using another PSU.

any advice is appreciated

Thanks in advance

Code:

Miner Type Antminer S9i
Hostname antMiner
Model GNU/Linux
Hardware Version 30.0.1.3
Kernel Version Linux 3.14.0-xilinx-g16220c3 #83 SMP PREEMPT Thu Jul 12 11:42:53 CST 2018
File System Version Mon Mar 4 11:45:08 CST 2019
Logic Version V2.57
BMminer Version 2.0.0
Uptime 1:14
Load Average 0.18, 0.19, 0.19

https://imgur.com/a/ZN8MZmg
https://imgur.com/a/XIS5ymD