Roku Suddenly Cannot Connect to the Internet

i have a Roku Express and I cannot connect to the wireless internet. The internet works for all of my other devices like the computer, phone, etc... all located in the same area. Not sure why the Roku won't work. I can stream from the other devices in the same area. This has worked in the same place under the same conditions for over a year.  I have rebooted the router and the roku multiple times.  I have verified the login information and it is correct.  I am getting errors 14.30 and 14.40 at different times.  I am on Xfinity and I am able to use 2.4gHz and 5.0 gHz, I have 50 Gbps.  I am no where near my monthly limit for internet.  I have also had Xfinity to do a device check and no trouble is found.  I don't think the internet is the problem since it works for other devices, including streaming and they don't have trouble.  The signal is reported as being excellent on the Roku, but will not make a wireless connection.