There will always be caveats, but the 5.x firmware isn't better nor stable as 4.2.130 or 4.2.176. To be honest, if things were working fine leave it. I have clients running 5.2 only when MESH is involved. Other than that I still have client on 4.1.185 or 4.2.130/.176 (1250ap) with no issue.
Do you see malformed packets on the switchports also?
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