Not especially.Odd that a nationwide issue has only been reported by 2 people here.
How many watch and record SD channels?
I certainly avoid doing so.
The 'other side' forum is reporting that Humax have identified an issue with Aura and that mux / transport streams and are testing a fix now... (but from a new user of that site).
That Aura issue may or may not be the same for 4000/5000 boxes? My advice is to talk to Humax Support!

. It was an odd beast made by Hitachi, at the time it was the thinnest TV on the market achieved by having the tuner in a separate box. Very high spec for the time and cost over £1000 with good reviews but did not catch on with the public. Richer Sounds managed to get hold of a batch of just the screens at a good price and I just used my T2 as the tuner. It did me well for many years until I replaced it with my present Samsung.