Just a thought, could this "screeching" problem be caused as a by-product of the compressing technique used by Now TV when streaming.
As this noise happens on no other transmission or streaming service I use then I guess it's a strong possibility that this is something unique to Now TV. For example, I watch YouTube without any ill effects, I also watch other Roku channels which usually buffer every 15 or so minutes but do not screech.
Anyway, as mentioned above, it's just a thought.
Something Davey said pointed to another, I think, obvious clue to this screeching problem, which seem to be exclusive to the Roku 3 and Now TV black box which both run on the same OS.
Also back in the day when I had a white box there was no screeching, at least that I can remember. So I believe the "screeching problem" is probably caused by a combination of Now TV's compression technique and Roku's current OS.
However, if I am right, it will require Roku and Now TV working together to fix this problem.
Would be interesting to know going forward, once they go on sale and folk start using them for a while, whether this sound glitch will not be an issue with the new Now TV Stick?? If there is something currently inherent with the Black Box that causes it, would the Stick be an option for avoiding it??
A few months down the line when I need to get a new voucher and I can get this packaged with a new Stick device I'll certainly be able to find out for myself, but would be good to hear from anyone who jumps in quicker whether sound glitches still occur on this new device.
My sound glitches are definitely fewer and further between than before, but maybe the stick will be an option to end them for good?? Or my longer term plan to avoid them will be in 2019 when I can watch the full Now TV selection via my BT TV Youview box.
@Thom77 I haven't noticed any sound glitches on the Smart Stick. It seems that these glitches have been reported on Roku 2/3 devices and their equivalent (which would be the black NOW TV box) and seems to be linked to Roku firmware.
Like you it's definitely decreased lately, but I suffered quite a few watching a movie last night.
Good to hear that your experience of the smart stick is positive for having no sound glitches and if it is therefore an issue with those Roku boxes you mention and the black box equivalent, that might make me get in there quicker when the sticks are released.
My last bad experience of them was a couple of weeks ago when watching The Orville 'live' on Fox, but 99% of what I watch is catch-up and it tends to be fairly infrequent..... just infrequent enough to make you think it's cured, then a quick blast to remind you it's there!!