The new beta has now been release - PMS 1.31.3.6868
(Scanner) Certain episode filenames could lead to excessive memory usage (#14215)
I suggest you update to the beta which has a fix for the crashes caused by excessive memory usage. If your problem is different and the crashes continue, please provide debug server logs captured soon after a crash and if you can, also look for any .dmp files within %TEMP% (windows) $TMPDIR (other platforms) created at the time of the crash and zip and send to me by Private Message