Must be the USB port that wears out... or the neural pathways take strain...lol
Where computer hardware usually works at a 100% cpu during upgrading etc... it's ALSO working exactly this hard each time it's switched on or rebooted...
Rebooting hardware puts it under a bit of pressure... and i have found that in general ... if your hardware is gonna fail - it usually does so during the Setup or Bootup procedure. (And i'm sure NOBODY EVER reboots their tytn

)
I really can't think of any other reasons why your TyTN/JasJam will get worn out because you're putting new clothes on it.. it's not like the Flash Eprom will start to strike or anything...?? is it?
I might be wrong.... enlighten us with details should there be proof of this.
I think i've flashed mine like probably 20 times now... the USB cable disconnected once at 58%, once at 5% and once at 98%... it also froze up at 99% once...
It's still going strong... i also dropped it the other day while it was raining onto wet tar... it bounced a metre high, fell down again, the battery and it's cover went flying in one direction...phone in the other... everything was wet...and there was a little scratch on the one corner.
Still works.
If dropping it in the rain onto tar doesn't kill it... i can care less about what "loading software onto the Eprom" is gonna do to it