Try using it with power plugged in. Does it behave ok in this mode? If so it is likely that your battery is getting old and needs replacing. You can do an upgrade with the unit plugged in but it won't fix a bad battery. A battery is only good for about 18 mos to 2 years. Pay special attention to the battery gauge on the unit but you will need activity to see it change since there is no screen update between pages. Try a eBook format that leaves the status bar on the screen like mobi.
Dale
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