OpenHAB slow response

I have OpenHAB with Zway binding, and some other bindings (MQTT).
My problem is that when I restart OpenHAB everything works for about 10min, then it starts to get slow.
When I click on OpenHAB to power on some Zwave light, i need to wait for about 5min. Then i restart OpenHAB, and
everything works in seconds. Is there someone with an idea how to fix that?

Logs would help


I commented on similar problem here => OH 2.2 Z-Way sitemap freezes after an hour. From my perspective Z-Way binding is cool idea but I had many problems with it including errors in JSON parsing coming in + CPU load increasing over 100% on RPi. I have changed to Z-Wave binding and it runs without problems for a few weeks already.