Are you referring to settings not getting saved (if then there's probably no /overlay), or to it becoming inaccessible?
Every device starts its life in snapshot. That's no indicator support is (or isn't) mature.
For the VLAN issues, see this topic e.g.:
I haven't tried any VLAN setups on ipq40xx devices anymore, but I bumped into that issue as well back when I deployed my first ipq40xx device.
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