Correct me if I am wrong, but this is my understanding of what may be happening.
What I have read, is that the safeties are internal, and are deactivated by pulling the trigger. Apparently, only a tiny rearward movement of the trigger (a few millimeters) is enough to deactivate them. So, friction of a gun moving in a tight holster might deactivate the safeties.
The striker on these pistols is fully cocked, pulling the trigger only releases them. In contrast, with a Glock, pulling the trigger is required to finish moving the striker completely to the rear.
The combination of all safeties being deactivated, combined a with a constantly fully cocked striker possibly could lead to an accidental discharge sometimes.