Leak fixed filled to 155 and monitored for 15 hrs and lost 11 bar, thought I had another problem after emptying cylinder.
Dry fired 2 shots and in 6 hours pressure stayed the same.
Filled to 218 and again lost 4 bar in 2.5 hrs, dry fired a shot and again no loss in 2 hours.
Don't know if this is a feature of Daystate but at least problem solved
AA S510 CS700 Bushnell 6500