I have had each issue in the title happen one time each since the latest update.
My game completely crashed when I was in competitive, and I had to hard restart my computer to be able to get back in. ALT + TAB or CTRL + ALT + DELETE did not work, so I had to hit the power button. Luckily I was able to get back in the game before the 2 minute grace period expired since I have a SSD.
The other issue with my game sound going mute was weird. I was again playing competitive and everything was normal until I died. When I respawned my game sound was completely gone. Then I died again, and respawned, and my game sound came back on for the rest of the match.
These issues both just started with this latest patch on Tuesday May 21st.
The map I was playing when it went mute was also Havana. I was playing Ashe at the time. It happened when I died then respawned. It corrected itself when I died and respawned again. Very weird lol. Thanks for the reply!