It seems that HOTS uses a really large amount of bandwidth when in game as opposed to other games. I usually have a podcast on youtube running while I play and it always sets my podcast to buffer endlessly while in HOTS ONLY. Not affected by any of my other games. Yes, I turned the quality to minimum to see if that would change anything. No I am no longer having latency issues with the game itself. Pretty sure this is on you.
Haven’t noticed this myself and I also generally have Youtube open for music while playing. Are you by chance using an AMD card? If so we may want to try opting out of the AMD User Experience Program to test as that’s been resulting in bandwidth issues for some users.