The K4 has been in production for quite some time now.
How old is this one?
The K4 is the one that is glued together, so non-invasive things are the first to try.
Plug it into a known good wall charger with a known good cable -
Let it charge that way for a day or two.
(The charger is firmware controlled, there is no telling what charge rate it is now at when the firmware is obviously mis-behaving. Same with the indicator light, ignore it.)
Note:
This condition happened while making changes to the flash storage (deleting files - which on FAT32 writes to the file system directory).
See:
https://www.mobileread.com/forums/sho...49&postcount=3