audiomoths don't maintain set time

HI,

I have the following problem: some audiomoths don't maintain set time. Other AMs work fine.

In the order:

-I replaced the batteries.

-I updated the time with AM Time App.

-I configured with AM Configuration App by loading the settings that I attach.

When I switch to CUSTOM, the flashing green LED, indicating sleeping between recordings, does not come on, but the flashing green LED and the steady red LED do come on. Note that I didn't check "Always require acoustic chime on switching to CUSTOM".

If I put AM back on USB/off and recheck the set time with AM Time App. I see that the time is not updated (00:00:00 01/01/1970 UTC).

At that point I also used the acoustic chime app and the green LED went into sleeping between recordings. However, at the scheduled start time of recording, the AM did not record and went back to flashing green LED and steady red LED mode. If I check again with AM Time App, the time is lost again.

I tried to set a configuration with start recording 00:00 and end recording 00:00 and the AM (activated with the acoustic chime app) records correctly continuously. I therefore think that both the battery voltage and the SD card are ok.

Further checks: I tried with other USB cables and tried using another PC (I used both Windows Home 10 and Windows 11) and nothing changed. Applications and firmware are all updated to the latest versions.

I also attach the serial numbers of the Ams

Thanks for your help

Paolo Debernardi