[mrlambchop]

I'd wager a bad/worn NAND block, 'cosmic ray' or other electrical glitch was more likely to cause a checksum issue than anything else. It might be sudden battery disconnect caused due to the controller being dropped (per the first page), but there should be local capacitance on the NAND supply voltage size to last a page write cycle as sudden power loss is going to happen in a lot of situations.

I would generally critique the use of a checksum on this config data without a backup or ping-pong writing system specifically because in the case of a 1 bit failure on something critical like cal or configuration data, really you want the data anyway and just hope that the 1 bit wasn't that important and also be ok if the bit flips back again on the next go around.