RBR 50 wifi speed slowed down

I bought Orbi 50 and a satelite unit in March 2019. It worked fine till now, but recently the wifi speed slowed down to 6 Mbps. My actual plan speed is 150 Mbps from Comcast. If I connect the laptop directly to modem or the Orbi router on Ethernet port, it is giving around 90 Mbps speed, but wifi is really slow and causing streaming issues too.

I tried factory resetting both the router and satellite and also tried changing channels, Wifi Settings (Daisy, MIMO,  WWM) as suggested on other threads, but nothing helped. Any help is greatly appreciated. Thank you!