Someone beat me to PEBKAC.

WiFi disconnect could be explained by the auto disconnect app but not connection. My N900 lives in offline mode at the moment and every night there is a request to go online, probably scheduled update check out something. Never had browser error but it was always in the official case (CP-321, I have the packaging next to PC).

Not sure I can remember an actual virus/malware entering repos during my time with the N900. The closest I can remember was the infamous *-patch packages