Good news!
What the crashes really mean is MC can't properly read some of your files. These might be bad downloads, corrupted files, strangely authored/edited files, or the like. It's more common than you might expect.
You can look through the logs and start moving suspected "bad" files to a different place on disk. I usually do a subdirectory at a time. Then you can examine these files outside of MC and see if they play, if you like them, etc and determine what to do from there. Each time I move a directory away, I restart MC and see if it crashes again. You can usually find the offending files pretty quickly, unless you have an enormous library and/or a lot of bad files.
Good luck.
Brian.