My guess would be a worn out batter. Li batteries don't last forever. My wife's old cell phone exhibited similar symptoms when the battery died. In her case, the phone was so old it wasn't worth replacing the battery, we just got her a new phone.
It is possible to replace the battery. If you search this forum waaayyy back, you'll find references to the method. It's not exactly trivial, but if you're careful and a little savvy you could try it yourself.
If it's anything else, it's probably not fixable, or worth fixing. You could try reflashing the ROM, just in case it is software.
Me, I'd recommend buying either a Sony, a Kobo, a BN Simple Touch (maybe), or (if you're willing to change file type) a K3. I still use my jetBook, but if it died tomorrow, I wouldn't replace it. I'd just shed a tear and shift everything to the K3.
Regards,
Jack Tingle
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