I tried to use Audiomoth 1.2 for long hours for the first time. For about 22 hrs continuous. Recording duration = 5 mins and sleep duration = 5 sec. From about 260 files it generates, 50+ files got bad recording.

Issue starts for a file like this >>>

And later entire next files looks lake this >>>

And next 2 or 3 files gets corrupted like this. And later it starts getting normal. And after few normal files, issue starts again.

Note: Frequency > 5K is OK as these are Cicadas and / or other insects. It is present with my other recorder as well.

Issue started appearing first after about 2 hours of use. And kept on occurring for next few hours (bad recoding for about 5 to 6 files continuously, then no issues for about 20 files, then again the issues).

Then normal for few hours.

And then again issue for few hours.

I am using the memory card supplied with the device: SanDisk Extreme 64GB.

Sample rate: 48 kHz

Gain: between Medium & High

Filtering: Band - 0 KHz to 16 kHz

Schedule: 00:00 to 24:00

Custom mode.

Battery: Duracell Ultra Alkaline

Max temperature: Aprox 35 Deg C

Min temperature: Aprox 25 Deg C

Humidity: Aprox 80%

Using the casing supplied with the device.

For reference, normal (OK) file from the same lot (without cicadas) looks like this >>>

Can someone please help with this issue.

Is this device issue, memory card issue, environmental factors (temperature / humidity), mobile tower signal, high power electricity line, battery?

Regards,

Nishant.