Will using my own router resolve some issues with the T-mobile router?

JeremysIron wrote:

I'm having a few issues with my 5g T-mobile gateway/router (the cylinder) with my HP printer and maybe my Roku (I stopped seeing its Wi-Fi a few days ago). What I'm wondering is, if I use my own router in bridge/AP mode and connect to that, will that resolve potential issues I'm seeing? Or no, since it's all part of the same network anyway?

Personally, I think using your own router will resolve issues. I simply plugged my eero 6+ into an ethernet port in back of the T-mobile gateway and it worked.  I only had to sign in my network password with various devices, even though it was the same eero password as before.  Try your router and see if it helps. If not, go back to using the gateway as a router.