after the Oreo update my 65XF9005 stops playing videos (mkv) after 30 minutes. This issue is also from internal streaming device and also from USB stick. Since it is exactli after 30 min I assume its a software issue. After freezing of picture and sound I have no other option than to restart the television and start from the same spot, but after 30 min. again... This was not the case before the update (I cant confirm this on the usb, but streaming was OK).