A few days after upgrading to the latest (as of this date) firmare, my N95 started restarting, most often noticed when on a charger cradle on my desk w a full batery, w NO applications open, but once while talking. It MIGHT be happening when in its case, when I just wouldn't notice.
Oddly, there's no PIN code prompt when the system comes back up, nor an Unlock Code request, which is set to always occur after a manual power down. Meaning, I've no way to get an exact restart count.
FYI: All applications were manually installed after firmware ugrade (NOT via a "restore"). Only previously used applications were re-installed.
Yeah, I could format the phone and redo everything, but maybe others have found other, less painful solutions?