❓ Help ATEL U270 ALR-LTE-CPE - "Module AT Failure"

[brv64b]

Hi
First time here.
Does anybody known anything about the error message above ("Module AT Failure") ?

4G Status: Module AT Failure
Frequency Band: 31 (450 MHz)
Cell ID (PCI)/Globe Cell ID: Unknown
Signal Strength (RSRP): -109 dBm
RSRQ: -12 dB
SINR: 14 dB

My ISP tells me that it's a (my) router problem. I think it's a problem at the cell ..
?

Regards
brv64b