I cannot be 100% certain the bug is patched, however, I've not experienced the volume bug since updating back to v1.2.
I know some work was done on the volume section because it reacts faster, elevates smoother, times out quicker back to the play screen.
There have been two occasions where it looked like it was going to start bugging, (after all the other times I'd picked up on it) but all that happens instead now is the volume doesn't react for a spilt second and continues on normally after a very brief moment of unresponsiveness. So I'm crossing my fingers the whole volume section has been rebuilt in v1.2 update. I'll keep a close eye on it and wait many weeks before 100% confirming, but it's giving me the impression it's stabilized (so far)
I see another member reported a page or so back his has not had it happen since updating either.