AC1750 AiMesh Wi-Fi System - Cell phone bars fluctuating, some laptop lag

I recently purchased and set up the ASUS AiMesh Wif-Fi System AC1750 RT-AC66U B1 2 Pack. I've been having non-stop issues with Spectrum for past month, finally they came to 5th appt yesterday and replaced modem (2nd modem replacement in a month), and I decided to go from their router to this ASUS Mesh system.

I'm still not getting a good 2G signal or the speeds I should be getting. The bars on my Samsung Galaxy S9 cell phone keep fluctuating, and I had a film pause a couple times while...

AC1750 AiMesh Wi-Fi System - Cell phone bars fluctuating, some laptop lag