@mkriesel , we do not have enough information to be able to pinpoint the root cause, so please try to perform the following test:
on voxl2
systemctl stop voxl-px4
cd /usr/share/modalai/voxl-esc-tools
./voxl-esc-scan.py
The output should look similar to this . Run this scan back to back several times and check if all 4 ESCs are detected each time.
If the esc scan result on voxl2 is not consistently detecting all 4 ESCs, please repeat the same test on a linux PC (you will need the aforementioned UART cable). You can download voxl-esc tools from the git repository here and run the same test, the output should look like this -- almost identical to what is expected when scanning on voxl2.
Thank you
Alex