WDS Nano and Mikrotik high latency

Hi,

I got a Mikrotik 411AH with 3 Nano2 in WDS. The MT is setup as dynamic WDS with the Nano’s using only the MT as peer (auto not ticked).

Signal strength, noise ratio, CCQ is very good. Distances less than 100m from furthest Nano to the MT.

Problem is that the wifi traffic is VERY slow with the ping times between the stations more than 2000 ms. CPU on MT runs at less than 5%.

What may be causing this?