I record overnight with my audiomoth but I have lost recordings after upgrade to 1.8.2. Last night was scheduled to record from 17:10 to 06:30, but only recorded from 17:10:01 to 23:59:50. The LEDs displayed normal i.e. slow green flash with switch on Custom. I use rechargeable NiMH batteries and the header of the last file recorded at 23:59:50 11/10/2023 showed voltage 3.9V. The SD card is 64GB Sandisk Extreme. The config.txt file shows

Device ID : 2423C2045F25698C

Firmware : AudioMoth-Firmware-Basic (1.8.2)

Time zone : UTC

Sample rate (Hz) : 192000

Gain : Medium

Sleep duration (s) : 5

Recording duration (s) : 5

Active recording periods : 2

Recording period 1 : 00:00 - 06:30 (UTC)

Recording period 2 : 17:10 - 24:00 (UTC)

Earliest recording time : ---------- --:--:--

Latest recording time : 2023-10-12 00:00:00 (UTC)

Filter : High-pass (15.0kHz)

Trigger type : -

Threshold setting : -

Minimum trigger duration (s) : -

Enable LED : Yes

Enable low-voltage cut-off : Yes

Enable battery level indication : Yes (NiMH/LiPo voltage range)

Always require acoustic chime : No

Use daily folder for WAV files : No

Disable 48Hz DC blocking filter : No

Enable energy saver mode : No

Enable low gain range : No

Enable magnetic switch : No

Enable GPS time setting : No