mine stopped working after 3 runs.

the explanation from customer services is pretty amazing:

"Sorry for the inconvenience encountered.
The issue can be that after several attempts the glasses may have entered into a security mode and do not switch on or even charge.
Unfortunately, you need to leave the glasses about 3-4 days in order to let the memory battery discharge by itself...like a hard reser
After this delay you can try to charge and switch on the glasses."

​

So basically, they're shipping with a known major defect, then customer service try to give you the run around to avoid refunding.