No problem here.
4 smokedetectors, 3 heatdetectors and 1 motiondetector. All installed in 1 go and running without any problems, for more than 4 months now.
Same hardware version here, Frient app is up to date and Homey is running 8.0.6 since 9 hours.
So same as with you, only I have no problems and everything is running flawless.
I bought the frient motion pro 3 weeks ago and now it is broke. Reset (15 sec) does not work and adding the device to Homey doesn’t work. Disappointing.