From my experience… Stick with less range of motion past warm-up and focus more on muscle tension (continuous). Make warm-up sets and rotation work your priority (light weights). Then keep at it, but not to repeat myself to bore you. Focus on controlled movement ~ When I mean Focus - keep it razor sharp from the beginning of your workout to the end. Even when your dripping sweat and can’t see through your eyes. The seconds between sets focus on the movement and how you are feeling and prepare for the next set mentally.
This popping out is actually common and tends to go away after more time, I suspect it has something to do with the muscle not being in control through the whole situation and you allowing the weight to shift to your non-musculature. But I’m not a expert on the bio-mechanics. Just my experience.
You should worry when you stop taking the necessary steps, and skip a warming up or lose focus for a second. From un-racking to re-racking the weight.
You’ll find quite a few forum posts about shoulder clicking or popping though.

