By some reason, I've got lots of 0 bytes files and some correct wav files:

Unit is 24410E085728D5E5 v. 1.0.0 with firmware 1.8.0
SD card (SanDisk Extreme 64Gb U3 A2 XC V30) is far from beeing full. This is the configuration:
Device ID : 24410E085728D5E5
Firmware : AudioMoth-Firmware-Basic (1.8.0)
Time zone : UTC
Sample rate (Hz) : 96000
Gain : Medium
Sleep duration (s) : 1500
Recording duration (s) : 300
Active recording periods : 1
Recording period 1 : 04:00 - 20:00 (UTC)
Earliest recording time : ---------- --:--:--
Latest recording time : ---------- --:--:--
Filter : -
Trigger type : -
Threshold setting : -
Minimum trigger duration (s) : -
Enable LED : Yes
Enable low-voltage cut-off : Yes
Enable battery level indication : Yes
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
Any idea on why could this be happening? Are 64Gb SDs not reliable?
OK, then I take as lesson learned that we have to check batteries with a tester prior configuration and not rely on the "BAT 4.6V" reported by the config app, in particular for lithium batteries. Thanks a lot.