We are dealing with it as well and there must be others.
Although most of our issues are from the same models as you are experiencing, we are also seeing the Kidde P4010ACLEDSCA-2 models.
After contacting the local builders/electricians, they tell us they are changing 3-4 a week.
It was suggested to us that we advice the homeowners to contact Health Canada and report it.
https://www.healthycanadians.gc.ca/apps/radar/CPS-SPC-0001.08.html
We did have discussions with BRK and they are saying its anything from drywall dust to dirty electrical circuits (ie..LED lighting, appliances) which we do not believe.