I have the 2nd BV8000 Pro and both of them turned to grey screen of death in the 2nd 24 hours other words on next day. BOTH OF THEM ! They never touched water or similar things. Never falled down etc. I think it is a production issue.

Perform a firmware update followed by a factory reset. If this doesn't solve your display problem, it is an hardware fault. In this case please contact your seller to get a replacement under warranty.