3GS, power on hangs at apple logo, plus all kinds of other weirdness

started a couple of days ago, calendar app would crash on startup... or out of the blue, the whole thing would crash back to the apple startup logo.
anyway, it won't get past the logo on it's own, but I can get into restore mode and do a clean restore from there... all seems to work, or not... i've done about 15 to 20 iterations on this so far, but I just can't get this thing stable...
I've seen all kinds of weird things, Itunes suddenly losing the device... iTunes saying after it lost contact with the 3GS that there's only 16 gig there when there's 32, syncing Itunes library to the device causes, at varying moments, a crash of the 3GS...
not workable this way.
my old iPhone3G works fine (I pulled it back out the box, upgraded to 3.1.2, put all the normal apps on it, synced with me.com... it just works...
I've done recoveries, from a backup or as a fresh machine, also did *well tried* the erase/reset idea, it just came back to the apple logo and hung from there.
This thing worked just fine from 3GS launch day until now... bring it back and let 'em fix it? My hunch is that there flash memory that is flaked, or there's something with the CPU that's messed up (as if power/throttling isn't working as it ought to.).
is there anything I should have tried that I haven't done yet?
thanks,
Michael

thanks, was afraid of that.
called T-Mobile here in the Netherlands on what the procedure is, apparently I've got a TWO year warranty on the thing, so, they'll have it for up to two weeks, and then I should have it back (working) again.
cheers,
Michael

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3GS, power on hangs at apple logo, plus all kinds of other weirdness

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