Home Internet and wifi extender

I have a AirPort Extreme hooked to my T-Mobile Gateway and I'm using it to extend my network to my bedroom which struggles to cover all of my upstairs. It works for all my normal browsing on all devices but for some reason it causes my SONOS speakers to drop connections pretty frequently and also when I am using Microsoft Remote Desktop to connect to my work Cloud Server it drops that connection all the time which is super frustrating. I have to unplug the Airport during my work hours so I don't have the drops. I wish I could figure this out. I don't recall this being an issue with the previous t-mobile gateway. When I set the Airport up I just told it to create a new network and told gave it the same SSID as my T-Mobile gateway with same passcode so all devices could just hop to both devices with out having to connect to a different SSID. If anyone is having my issues I'd love to hear if you have a solution.