Ah, well, then...
Hmm... I strongly doubt this is it, but if you try the above suggestions and determine it's none of those things, and if you're a somewhat heavy user, then I'd start to wonder if the battery could possibly be at the end of its life.
K2is are only around 18months old, iirc, but age doesn't matter so much as how many cycles it's spent. Temp extremes, particularly heat, will also shorten its life.
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