Since the latest patch, I experienced multiple times in Standard that I finished my turn, and would then wait on my opponent indefinitely (> 3 minutes). Nothing happens, no time ribbon etc, can’t even concede, only ‘exit game’.
Same occurred to me in Battlegrounds (playing Lady Vasj), I bought a minion and the game partly froze with the minion (2/2 bomb-mech) still hovering over my hero. I couldn’t spend my gold or move minions, but the time ribbon would expire (indefinitely, it never ‘finished’ the turn). Again, could’t concede, only exit the game.
Didn’t know where else to send this, hope the issue can be identified 
Greetz