It's some time since this issue was raised but I have recently set up a BT Box Pro to replace our 4k box. This is our second BT Box Pro. This one has an issue similar to the problem here. When set to pause live tv then return to play from the point paused, it plays normally at first then, if you fast forward to live tv, after a few seconds the screen goes black then attempts to rewind result in the chaos. The system judders back and forth between rewind and fast forward and it is impossible to watch that particular channel without changing channel then selecting the original one viewed. Even then, on changing back to the original channel and watching for a few minutes, it is impossible to rewind live tv even though it should have been possible to rewind back to the point the channel was selected. I originally thought that the black screen was simply the transmitting channel causing the fault but this happens on whatever channel is viewed. The system has been returned to factory default but the problem still exists
Our first box was returned and replaced because I was not at all happy that the box was functioning correctly when set on surround sound using our Sonos Arc and Play 1's as surround speakers. Using our previous 4k Box that could record 2 channels, surround sound worked perfectly. However, the BT Box Pro does not transmit sound to the surround speakers unless set to stereo when it should do so when a program is transmitting 5.1 surround. The speakers and surround sound work perfectly using only our LG OLED tv and our Sony Blu-Ray player. Sonos are superb and spent some time checking out our system and found no fault with the speakers. It seems the fault is with the BT Box Pro and at the moment I regret "upgrading" to the BT Box Pro.
