Samsung Galaxy S II :: Shut Downs - Apparently When Data Roaming Disabled?

i'd only used the sgs2 for a couple of days before going on holiday for a couple of weekshile away i turned off data roaming (there was wifi where i was staying)ll advertised sw updates had been appliedhe sgs2 was repeatedly shutting down - not rebooting, powering off - sometimes 4-5 times in a single daya couple of times it did this just as i pressed the home key - the screen would light up, but in less than a second it went black - the phone had turned offit happened when on battery, it happened when plugged into the charger, in a case, out of a case, in my pocket, sitting on a tableried lots of things, deleting apps, reset, etc., no difference'd turn it on when i noticed, by chance i found that sometimes it powered up with data roaming enabled, all by itself, annoying, i disabled it again, then always checked after each shut down, maybe one in 4-5 times it restarted with roaming enabledow that i'm back in the uk, no more problems, hasn't shut down once in three dayssim is vodafone, the network the phone roamed to was vodafone spainaside from roaming, and turning off data roaming, nothing else changed