Forerunner 955 HRV Status is inconsistent and not reliable

At least on my 965, the problem was solved by force-rebooting the watch (keeping the light button pressed until the watch turns off). After that the HRV was back to normal the next night.

(Based on that I'd say it's most likely a firmware issue. Hopefully they'll be able to fix it soons, Garmin seems to already be aware of the problem.)

I don't think that solves it on 955 I've tried rebooting and it's still stays that way, I hope it's a firmware issue as I don't want to do another change :( 

My HRV data has full coverage pretty much every night. I have small drops on rare occasions but nothing like what you’re seeing. I have an FR955 that is always running the most up to date FW version (but not the betas). 

Image from today after a reboot last night.

Just checking the possibilities: how tight/loose did you wear the watch during the night?

I have tested the default band that comes with the 955 being tight/loose, I've also got a velcro one so that it's the best possible way -> my previous watch did not have this problem with the default band no matter how I wore it.