Start with cleaning the cache and rebooting to see if that helps.
sudo systemctl stop openhab2
sudo openhab-cli clean-cache
sudo reboot
If the issue remains l would try using a different persistence service as InfluxDB can sometimes be very taxing on memory. If it meets your needs RRD4J works well with the RPI.
Another thing to try is using a new SD card. I know you mentioned the SD should be fine but unplugging the power is never good and will eventually lead to a corrupt SD card. Once that happens troubleshooting/debugging becomes very difficult. If you have a spare SD card I would make a backup, install a fresh image, and restore the backup on the new card.
Also, here’s an interesting topic that may help.