If it popped out once it can pop out again. My first P10c did that a few times. My 2nd P10 had more spring tension, so I bent the 1st spring just a few degrees down and away from the ejection port side
This.
Happened to me also but only when the pistol was warm/hot. When the pistol was cold there appeared to be enough spring tension. Heated it up with a hair dryer and ever so slightly touched the spring and it popped off the slide stop. Fixed with a very slight outward bend to the spring.