We've not experienced any crashes on exit for MC 8.8.2 and mocha 5.5.1 in our tests so far, so this is peculiar.
Are you saying mocha in BCC is also misbehaving?
Does the crash only occur on the exit of the mocha GUI?
Did the graphics driver update occur before or after the crash?
Can you provide us with the mocha log from the mocha GUI Help menu (under View Log)?
It may be worth testing the new beta of 5.5.2 to see if you experience the same issue. If you'd like to be involved, please fill out this survey and we'll be in touch: https://www.surveymonkey.com/r/ML228BV