For customers who are using a Xfinity wireless network, we recommend changing your router settings for the 2.4 GHz band from g/n to b/g/n, as customers have stated that this helped resolve their issue.
For troubleshooting purposes, have you tried connecting your Roku device to an alternate wireless network, such as a mobile hotspot, to see if you are experiencing the same issue occur?
Re: Roku Express won't stay connect to Xfinity gateway
Danny, FYI If you have the lowest quality Xfinity supplied modem/router as I had, its settings could be changed in the way you recommend. But as the unit I have xb7-t with essential services IT IS NOT ACCESSABLE with this service level. But in the manual it states it can provide this result by reverse or backwards connectivity... Not exact text. So some people won't be able to achieve the fix necessarily. Seems I Repaired my issues! Yes good luck everyone else! 🤞 I forgot this issue but I just checked mine by powering off and on ITS STILL CONNECTED!!! 👏👏