I have 2 AMS and 2 X1C.
I have one in the school library and one in my room.
Swapped the AMS and the error followed the AMS.
Cleaned both and checked the tubes. everything hardware looks the same on both.
the software on my AMS was upgraded during the 1.08. but i dont thing the downgrade to 1.07.5 altered the AMS firmware.
It happened after the 1.08 firmware upgrade