Just like with MakeMKV, if handbrake is actually CRASHING, make sure your support request on handbrake.fr includes the event view entries for the crash.
Or try their nightly build - if you're still using the handbrake release version, they're getting close to releasing a new one, with LOTS of fixes.
OS error "the system cannot find the file specifed"...
Re: OS error "the system cannot find the file specifed"...
MakeMKV Frequently Asked Questions
FAQ about BETA and PERMANENT keys.
How to aid in finding the answer to your problem: Activating Debug Logging
FAQ about BETA and PERMANENT keys.
How to aid in finding the answer to your problem: Activating Debug Logging