I am usually complaining that the ads are played at much louder volume
than the program contents, but not this time. On live off air TV it is
fine.

The problem is Netflix and AmazonPrime, plus to a lesser extent catch
up content. Catch up content often has the speech swamped by music or
sound effects, so I cannot make out the speech. Netflix and Amazon has
similar problems, except when then is some noisy action, explosion or
gunshot - the volume becomes so loud it is near deafening. SWMBO has
just been watching Crossing Lines on catchup, which often has defening
passages in it. She says it is my TV.

I have tried various sound settings in the TV, but nothing seems to
have helped - has anyone found a fix.