I bought some new batteries for my E2 - put them (they were not a budget brand) in and when I switched it on it basically powered straight down. Odd.
So I then tried some rechargeable batteries. This time they showed as fully charged but within a minute they'd gone down to flashing and low battery warnings. However I kept using it for half an hour and it kept going ...
Before posting here I've upgraded to the latest OS from the Korg site and done a factory reset but the problem remains.
It's already gone back to Korg once for a faulty LED - back again for battery issues ?

Cheers
Ian