Something is messed up and I would start from using only 0.5 degree increments for setpoints. This clarifies your issue on the other post. When you seem to face the issue, if you have SSH access, check with the top command your CPU load. I believe something is pushing the Pi to work too hard (maybe stuck in a loop?) and it may cause all that.
I would also suggest these steps too to make sure nothing messed up is left behind
sudo openhab-cli stop
sudo openhab-cli clean-cache
sudo openhab-cli reset-ownership
sudo reboot