I switched on my laptop after not being on for five days, and Comodo said there were probles with defense + and that i needed to run diagnostics. i did so but that did not fix the problem. I restarted and it then all systems are running… but it keeps telling me my vius definitions are out of date. everytime i run the updater it gets stuck at 30% and then a window telling me there are comodo updates available pop up. i click update and it says i need to restart which i did…but then the exact same thing happens when its booted up again…
I have had this problem as well. When your PC reboots after the Comodo pop-up tells you to, then once back at the Windows screen, let the red flashing light that signifies your PC working in the background come to a complete stop, then click on start>turn off computer>restart, and let your PC reboot again waiting till all signs of activity are finished then sign in. See if this helps, it did for me.
Do I understand correctly you keep getting the prompt to restart at the 30% point? What av database version is CIS reporting? Look under Miscellaneous → About. Does it stay the same each time?