Muscle Spasms

I dislocated my shoulder many years ago and getting more mobility in my shoulder has been a challenge as I’ve been fairly guarded about the range of motion fearing it would “pop out”.

I have been making some progress in my belly down postures and bow pose with regard to expanding/stretching my shoulder/chest muscles. In the last few days, however, I’ve felt some spasming just below my collar bone. It doesn’t last for very long, and it’s not very intense.

Any suggestions for getting past this?

Thanks!