Guys .. currently i have issues with Unifi 300mbps

5ghz wifi not able to reach above 100mbps for:

1) Mibox (which is located near the router)
2) My Windows PC even can get full 5ghz signal
3) My laptop even bring it right beside router

but im able to get 2xxmbps on my phone (LG G6) on 5ghz band.

Used to be im able to get nearly 300mbs on my Mibox & laptop.

on ethernet cable i can get over 300mbps.


anyone know whats the problem?