This is what id focus on vs being a bug.
Get some log entries look at actual facts etc
Ive tested Orisec Detectors at length (granted not panels) and not found serious issues.
Trus the hardware to start with, get yourself an audit trail and log and it may wall be obvious. It Usually is. No manufacturer is daft enough in the professional security world to release unstable code. They would be removed from the market in that heartbeat.