I have had a Cavius Wireless "system" including 6 Smoke Detectors and 1 Remote/Torch here with the Cavius Gateway (Which is no longer available) / App etc.
3 of the units developed a random false detection. (Not at the same time) I had a spare and re-purposed one. When the 3rd unit failed I contacted Cavius here in NZ to see if they were aware of any problems. (Not Low Battery alarm, and a new battery made no difference, or extra vacuuming, or air blowing also made no difference)
Cavius couried me replacements at no charge, including a pre-paid bag to send back the faulty units, and even logged the pick-up job for the courier.
I can't recommend them highly enough. Even without the Gateway, when 1 goes = they all go off and the one which triggered it flashes!
Well done Cavius NZ.
10/10 For Service and Result. Full system restored and tested.
With a 50% failure rate, you'd certainly hope for some service!