Hot Spot stopped working

OK I have the same issue of the MiFi 2000 unit not working at all anymore. It will say no connection when trying to access any website and so am forced to use my phones hot spot and put up with the warning to turn off the phones hot spot!

The odd thing is as said it shows I have an amazon or two connected. I assume is the smart TV?

I have Alexa disconnected but that will also show up if plugged in, but again no website connections so as said have to use the phones hot spot for internet connection. At times I will get the DNS not responding error message

I am also unable to get onto the Admin website as was once able to.

I am close to the end of our 2-year contract and do not wish to get into any other new 2-year contract with T-Mobile

Is there a simple fix for the 5G MiFi  M200 DNS like replacing the sim card?