OK, then it really looks like there is some problem in the device flash memory, which also affects Harmattan.

Reflashing the device can help, but of course it is fairly drastic way to fix problems as it will wipe all user data from the device, hence I always suggest other possibilities first.

Of course there is always the rare possibility that there is some HW problem in the flash memory, in which case it may happen that the device cannot be flashed and will not work any longer after the flashing attempt...