Yes you can disable it, but it to help us diagnose the problem, could you first enable Debug logging in the Status window and then after it happens again click Show Logging in the Status window and then send the logs to me at [email protected]?
The actual par2 repair however isn't changed, it's handle by an external program. That one was also updated, so with your logs we can see where the problem is and fix it
If you like our support, check our special newsserver deal or donate at: https://sabnzbd.org/donate