First Alert Z-Wave Smoke Detector 6 False Alarms in 2 months

Hi ALL Since the last two months, we have been getting false alarms from 3 of our First Alert Z-Wave Smoke Detector alarms, the first time I thought it was due to battery issues, so I replaced the batteries for all 5 alarms, BUT even after that every now and then the alarms have been triggering falsely and the emergency services calls in. This has been causing a lot of problems, and mainly when we are outside away from home, at which point we are not sure if the alarm is real or a false alarm. Requesting the Ring community if anyone here also have this issue.? Is this a hardware issue? as the first alert z-wave smoke/CO alarm devices says on the back to replace after 7 years and we are at 4-5 years time span for all our alarm devices. I am putting the model number of the First Alert Z-Wave Smoke/CO Detector if there are any manufacturer-related issues or if they have been discontinued, please assist or reply with your inputs or suggestions. First Alert Model no - ZCOMBO, Thank you