I Have a Raspberry Pi B+ with the Digi+ card.
I had a lot of trouble when I was under OpenELEC : a deaf swellings that appear randomly while playing movies.
I was thinking about a problem from the film, bad encoding or another, but unfortunately not.
So I passed under OSMC, no problem during 1 month viewing and this starts again.
I do not understand, I re-encodes each film but this is not enough.
To summarize: swelling that appears randomly. I am obliged to leave the film and restart it to remove these noises.
Sorry for my bad english, I do my best :)