I did not have this problem: not with the older v1.22 firmware that it was shipped with, nor with the latest v1.45.
@nioh Does yours show OFF on the screen when it powers off or it just suddenly dies ?
My opinion is you should return it and exchange with new one if you really like the device.
There is something I would like to mention in regard to this battery thing though: mine was shutting down at ~20-25% level on the display when new. I initially thought this
was a firmware issue and the battery management wasn't working correctly. It seems to be better now, but still not perfect: at lower levels the charge seems to drop very quick and it happened to me that it shuts down when I am expecting it to still run for half an hour maybe more.
It shows "Off" while turning off and it does it consistently like around 20 minutes.
Battery is fully charged.
I'm doing some more tests now with different devices to double check, will update later !
Thank you for all your support guys !
Update:
I connected it to my iPad and it hasn't turned off for the past 45 minutes.
This makes me think it only happens when connected to the PC.
Could it be the USB driver, port, cable ? Will do more tests this weekend and see !
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