Hi Alex, Just wanted to follow up. We did a test with a new SD card (Sandisk Extreme Pro 256 GB) and it fixed the issue. The unit recorded as programmed until the end of Day 7 when the batteries ran out of juice (we were using a set of gently used batteries for this test). Many thanks for your help.

Hi Alex, Thanks very much for this helpful information. We now have the answers to your questions. We are using the SanDisk Ultra SD cards (photo attached). We have tried using the Summarise AudioMoth Files, but this did not work for us. We have already converted all the WAV files to FLAC using Raven Compass. Potentially because of this step, no information was written in the summary excel file (summarise steps attached). Could SanDisk Ultra be draining much more than SanDisk Extreme? We will try to do another test, keep the wav files, and do the summary to get more information on voltage drainage. Thanks for your help, The Sangihe Dugong Team