I've had my K3 freeze up a few times, which I attribute to the known issue caused by the lugs on the leather non-light cover, which may apparently be making contact with the device's circuit board.
Because returning the cover would be such a hassle given that I live in Africa, I simply took a file to the lugs to make them very slightly shorter, then blacked the freshly-exposed metal with a felt-tipped marker pen. Been fine ever since!
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