Verification and Validation Test- No prints on print bed and ghosts in the tray

Is there a way or process to verify the printer (probably laser) working properly. I recently had 2 prints on a small part, and another on a successful part fail. Fail as in there was no raft for any of the parts, only the ghost shape on the floor of the print tray. The first 2 separate prints were this way on a part I had never printed before, the third print was a known (i created) parts and it failed in the same way. Print tray is new as in this is the 2nd litre of Gray v4 resin in it. Recently had a firmware upgrade, and a string of average successes. thanks Les Davis