Troubleshooting today after work:
Removed P10 with SRO from safe - dot still dead
I have spare batteries on hand - common for a lot of my uses
Removed original battery
Original battery tested good on battery tester
Since I had everything opened up - installed new battery
Dot is back on
Per GJM, I insured I had the cover on tight
Will take to range hopefully this weekend
Still not sure of issue (cap slightly loose?) but happy dot is one for now
Note: primary purpose of this pistol is range use - still carrying iron sights
Thanks GJM