Bizarre sleep record on some nights, now ongoing issue

[Moss_66]

My nights are variable with lots of wakefulness, yet on most nights I get a full record of my sleep with all the stages and wake ups, as well as longer periods when I’m unable to get back to sleep until I’ve taken more medication. But a few nights have been extremely disappointing because I don’t get the usual view of all the ups and downs but a simplified version with barely any data at all. The data is also totally inaccurate. Why on earth is this happening? These are often nights when I would really have liked to know what my night was like because of my medical conditions. But they weren’t THAT weird. Incidentally, the below views appeared on Tuesdays! I have Inspire 3.
Update: it’s still doing this! Is this due to some update or something? It’s started to show Restlessness as having lasted almost five hours, it’s absurd. I usually get 7-12%.  I’m livid as I really need the real sleep data, it’s the reason I have this device! 

[RiekoC]

Hello @Moss_66 

I moved your post from the Sleep Well forum to the Inspire 3 product help forum where you're more likely to get help.

[1Poolfit]

I'm not an expert. I do see that your Fitbit has a very low charge - perhaps that isn't helping.

I was searching for reasons why my sisters Fitbit is not recording sleep accurately (she has early Alzheimer's and I need to track her sleep). 

[AllanSyd]

@1Poolfit I think that is the phone that is in dire need of a charge. Though it is interesting that there is no REM sleep recorded at all.