Crashing when I enter loading screen with 'fatal error'

So, I enter loading screen, and some games I get stuck there and this pop-up comes on with 'fatal error (...)'. I cannot close anything or do anything on my computer once this happens. I have to sign off and relog completely. I have had this in 2 games already and a couple of friends of mine have had the same problem. Are these bugs with the patch update (just like the death recap telling me my OWN ADC DID THE MOST DAMAGE)? and my second question would be: Will this count as leaving? I mean, I can't help it and I don't know when this behaviour kicks in. It's just RNG basically. Any help or ideas regarding this issue?
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