When you set DMD2 as the default home launcher it means the launcher is DMD2 and not Quickstep.
If Quickstep crashes it means it is still running when it should not be in use, we been dealing with some similar issues on our own devices FIRMWARE but we mostly solved it.
Your case would require attention from the device manufacturer, its not something DMD2 can fix. I would suggest not using DMD2 as the default launcher or not using it with Rotation unlocked (DMD2 setting), leaving rotation unlocked means the device can rotate while ridding, which is something you dont want either.
DMD2 Project Manager & Lead Developer
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