So I analysed /var/log/syslog and found what happened.

The following log entry was written into the log file at a rate of SEVERAL HUNDREDS OF THOUSANDS OF TIMES A SECOND.

kernel: [3314.xxxxxx] usb 4-4: users: process 3751 (indi_qhy_ccd) did not claim interface 0 before use

Using
grep -c "indi_qhy_ccd"
returned 211,661,935 matches in /var/log/syslog.

I think this is a major issue, but I understand that this might be an issue with the QHYCCD SDK, not INDI ...

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