ok. after 3 months... im returning my 2 ax88u to amazon. i dont think they worht the money atm. maybe in 2 years they are ok but for now i dont think so.
yeah connection at 160 MHz is really unstable. i turned off 160 and 802.11ax HE frame support and its working really well with the ac86u as a media bridge (5GHz).
media bridge ax lost internet after 24 hours... im now testing AiMesh mode. also this unit is being replaced on monday because wifi is doing strange things (after a reboot 2,4ghz light sometimes is on and sometimes off).
i have two ax88u. router/media bridge... 160MHz is really unstable at the moment. ill keep making tests but my experience is really bad. RMerlin told me to deactivate Roaming assitant on wifi, it seems to help, no problems in 12 hours now.