Pixels and stuttering on recordings

[wozles]

Hello.
I found another post entitled 'Stutter and pixelation on recorded playback' from 2016 but the OP did not come back to say if he cured it.
I have what seems to be an identical problem. Sometimes, usually when several recordings are being made at the same time, the play back on one programme jumps forward evey few seconds with pixelation. It lasts for the whole programme unless another recording stops, then it might clear. I have only noticed it on HD recordings. I suspect a tuner. Is it possible to identify which tuner was used to make a recording?
I have a Vu+ Uno 4K with 8 tuners. Image 5.0.025.