High CPU usage on influxDB using dietp

I’m running dietpi (8.3.1) on a raspberry for years. since this night and without any reason I know (no sw-update), the CPU load on influxDB (v1.8.10 (git: 1.8 688e697c51fd)) has increased from about nothing to about 110% (25% over all cores). A reboot didn`t solve the issue. Any suggestions what to log/ test? Storage on pi is not full at all.

// Edit, I checked the log and it looks like a memory problem.
influx.log.txt (6.0 KB)

Seems to be solved by switching to TSI indexing.

problem is back after a few days. any suggestions what to do?