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It might be a hardware fault, such as an area of bad memory, and just a matter of chance that one firmware version uses that area for something important while another uses it for something else. If that is the case then there might be nothing in the firmware to fix, and it will just be a matter of luck whether the next firmware version triggers a fault or not.
If it was mine I would return the device that drains for a replacement while it is still under warranty.
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