Are you referring to the issue of the game like freeze framing after like 5 minutes of gameplay or even like on your second and third match. The game fully locks up with audio looping while keeping you stuck in the window.
If that’s the problem then you’re not alone [Main Thread] Game freezing with Intel i3 / Dual core CPUs
We have figured out a work around that fix for a handful of people but it costs some preformance and isn’t ideal. Blizzard is aware of our issue so we just have to wait