Orbi RBK50 Speeds Drop

I recently bought an RBK50 kit with an RBR50 router and RBS50 satellite. Set up was kind of a pain. It's been working for a while with some disappointing performance. Internet service that I get is about 160 Mbps. When I test speed through the Orbi App, the router sees 168 Mbps pretty regularly. But every couple days, speed I get on my wireless devices will only his about 40 Mbps. This is tested on a 16" MacBook Pro, and an iPhone 11 Pro. Only thing I can kind of correlate, is it seems to happen when I take the laptop somewhere else and return. If I leave the laptop home, but still take my phone, it seems fine. Not sure if just coincidence but that's the only logical thing I've come up with so far.

Rebooting the router fixes it for a couple days.

When at home, I sit about 15-20 ft from the router during the day. Same room, just opposite corner.

I've tried messing with different advanced wireless settings. I have set channels to ones that are not used in my vacinity. I have tried implicit beam forming on and off, mu-mimo on and off. Trying to do one thing at a time to see what causes it.

I'm outside of support, and right now my only option is to return it and try another.

Any help is appreciated.