The M17 is not the same P320 the DPD bought. It has a manual safety added so things are put together a little bit differently but I am not sure exactly what changes were made to add the safety. From the little I gave read, it seems to be an issue with the weight of the actual trigger. This may or may not be an issue with the M17. For what it is worth, SIG has issued a statement addressing this.
http://firelancemedia.com/sig-releases-statement-p320-safety-issues/
This is a piece from a place that reproduced the problem.
https://bluelivesmatter.blue/sig-p320-drop-test-fire/