Wifi getting throttled until restart

I am running OpenWRT 22.03.2 on a Linksys WRT1900AC v2 as main router
And OpenWrt SNAPSHOT r26436-7514d9bb6f / LuCI Master 24.135.65178~2bb1e06 on a TP-Link EAP225 v4 as Access Point

My issue is that after a while (not sure exactly how long but less than a day) the Wifi gets throttled to ~1Mbps per client, if I restart the AP the speed is restored to normal.

This feels like some kind of QoS setting but I can't figure out what it is