Just discovered very interresting thing - solution???!
TRY TO DISABLE AV-DB AUTOUPDATE for the real time scanner !
It worked for me! Probable cause - cmdagent.exe (AV-protection process) seems to try to update each time it scans something in the background (it should not do that). That means it does it almost continuously, especially when loading windows or applications. It causes system blocking with CPU continuous operation. That results in cfp.exe to do the checking/sendig/receiving packets (firewall process) - also CPU loading procedure. Something is not right as the two disturbs each other or sth.
Worth to mention that I do not use ‘cloud scanning’ - so it is not the case.