Holy crap!!! I figured it out!
I took apart my striker tonight and that didn’t fix it, but while checking everything out I found a lot of wear on the slide where it enters the frame at the front… I had tightened my Streamlight down decently tight last time I cleaned it before I shot it last time. The front of the frame was definitely squeezing the slide, I could see it relaxing as I loosened the light and there are definitely new wear marks there.
I loosened the light and presto: it functions perfectly. LOL. Darn…