after battery charge don''t turn of

i''ve got my m6 charge to my pc the hole night nothing special .
in the morning it wouldn''t go off. its 99 % of the bar befor turning off
but still on.

what can i do ?

Try holding down the enter button for around 30 seconds, and see what happens.

try this tread Frozen on 'Connected to USB' screen

also

the manual has tips on shutting down the player when it's frozen, look it up.