av detecting google chrome cache files as malware

more often than not, it seems that the av detects google chrome caches as Malware Unclassified xxxxx when im defragging or using ccleaner to clear them out.

another issue is that defence plus keeps putting my game files, for example steams games such as counter-strike, into pending files everytime i start the game.

same here, with FireFox since yesterday
unrecognized malware@8xxxx

and too on some files on my HDD