I am having a problem with
Sound effects just cut out randomly in the middle of the match. Sounds like the music and voice lines stay intact, but the gold trickle, ability sounds (Some of them. Fort’s bits seem to be intact), etc just COMPLETELY cut off. This has happened twice in 4 games so far
My device is
PC
My operating system is
Windows 10
I had the same issues today playing on my Pixel 3 phone.
Yep, happens for me from months on my note 9. 
Yeah a months old bug with sound. It seems it happens for everyone inside a match. i had other people confirm that sound was gone for them too.