Just watched Everest on 4K having taken advantage of the Amazon offer. At about 65 - 70 mins the sound went way out of synch, not talking 0.5 to 1 second but about 4 - 5 seconds. Switched off the surround and tried it on TV speakers - still out of synch. Unwatchable. Switched to the Blu-ray which was okay. Late put the UHD back in the (Panasonic) player and chapter skipped to that point, whereupon it played okay. Not sure whether to RMA the disc to Amazon, always the possibility an issue with the Pani firmware) but equally could be a major config error on the disc. So first stage is to ask whether anyone else had this issue with Everest?