Unfortunately, every time you crash, you lose all the cached material and there's not a thing you can do about it. A crash is not the same as a Quit and Reload sequence when all the stored hashes and incompletes are reinstated from the caches.

It's sad that you have an unstable installation. My experience with 2.9.10 and OS10.2.6 was good with no crashes (unlike 2.9.8 which was a pain). I suggest that you purge your system (as described endlessly in other threads) and reinstall the latest version to see if that's any better. That may solve your problems.

Good luck

David