AP ALT level off
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Behaviour such as this is tricky to provide an answer for without seeing the full sequence of events. It's not something I personally recall seeing reported before.
If this occurs again, would you be able to record a video of it (as well as the moments leading up to it) and include that in a ticket to Just Flight Support via the following link: https://www.justflight.com/support
I personally use the 'Instant Replay' feature in GeForce Experience for stuff like this. If that's enabled, it allows you to save a recording of the last few minutes of your screen, which can be useful for behaviour such as this. Other recording software will likely also have instant replay features.
That will then help us to try and replicate that behaviour and provide additional troubleshooting steps, or pass the behaviour on to our development team.
Mark - Just Flight