Slow 5Ghz wireless

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I'm getting really, REALLY slow speeds on 5Ghz wifi. 2.4Ghz wifi is perfect. Anyone got a fix?
Didn't happen with stock.
Edit: fixed with channel change from 36 to 44. Anyone else have issues on 36?

 

[77v77]

I have similar issue with 9.2.21. od Mi Pad 4. I get 85,69Mbps instead at least 110Mbps (I get 110Mbps with Samsung Galaxy S9 or via LAN). Was your problem even worse or?