New firmware 2.8.0 released right now. After updating it seems that the issue is solved. There was no note or any details about this firmware.

@Wayne-TP Hello, thanks for the quick feedback. Do you know if the current problem may cause damages to the heads or radiators? Or is it safe to wait until the public release of new firmware. And in...

@Markirl same on my side. I didn't make the link with firmware update but now I realised that it might be linked as it was updated 1-2 weeks ago. So far I noticed 2 out 8 valves making this noise.