Starter housing broke

[pat]

Ive got a 383 and it had starter problems. Shimming wouldn’t do it so I got a new starter. Put it on with no shims. It worked great. Started it at least a couple dozen times with no problem. Then a week or so later I try to start it and it makes a really bad sound. Not grinding, just like its stuck. So I go underneath and find that the gears are still locked together and it broke the front part of the housing off of the starter. So the gears are still locked, and the part of the bellhousing covering the gear on the starter is completely broken off.
What the #@#$ just happened to my brand new starter that probably wont be covered by the warranty?