M8S PRO L - dead voice remote

So, just after a few hours of usage in the first day, the voice remote stopped working in the day after - no LED; no IR (checked with a camera); no BT pairing...

Do you have any idea how to fix this? Or is a RMA for sure?

Already tried:
- factory reset
- new batteries
- BT re-pairing

It seems that the Shield has some sort of button sequence to reset the remote - do you know if this has something similar?

Thanks!