Hey GooglePerplexed , this is an on going issue apple have yet to address - at least in public.
You should go to the apple store book the appointment first .
Get a new Keyboard see if that fixes it .
Support said above to me after doing online support - that was logged ,
however I was refused a new keyboard without an appointment when I turned up at store ,
60mile trip to nearest store.
Annoying 1 week from Xmas with none available / my Studio resorting to using a DELL usb.
The store Rep said “well I can sell you one” hah ha .
Imagining blood, leaving without good day.
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The Issue for this annoying problem is , Apple.
Or you can blame the Keyboard or both.
It is to do with connection and range issues , and the logic used by battery monitor.
I have made extensive testing to come to conclusion "apples software is of the lowest quality" and is very basic
, it has been since OSX was released back on the G3s etc Bluetooth has always never worked on a Mac.
Any PC BT mouse will proove this true.
Is your KB out of range?
Apple design is very poor for wireless uses both Esp MacPro towers aluminium build is well known issue,
and the Keyboard alloy's top side block Blue tooth signals and cut range to as little as 0.5 meters.
Because of apples design and programming of the Battery monitor the indicator reads wrongly.
And the Mac is confused.
Any metal object such as an “office desk” can cause the range drop outs intermittently.
1
To kick in the issue , take the KB out of range or drop its signal for a moment , disconnect / reconnection.
If this state happens the monitor reads bad and out of calibration. And it gets worse the more it connects reconnects.
2
To cure issue , unscrew battery cover .
The KB will power down , Mac states disconnected.
3
Replace cover using same batteries.
The Batteries are now checked correctly for their current power Level.
4
Hire a Programmer to Rewrite apples Monitoring software/s to take into account range issues and momentary connection / reconnection of the Keyboard - Fail Safe logic - remembering last known bat level for X amount mili seconds.. I would use around 2.5seconds.
5
Glue an external arial BT to your Mac.
6
Modify a £5000k computer to use its own keyboard.
Use a cheap 15$ external BT4 USB stick.
You then need to remove Apples internal BT module 250$ or its power cable to override.