I have had this problem a number of times. I will be actively using the xFi app on my Samsung Galaxy S8. Thie problem typically occurs whn I go to the "network" button at the bottom. Instead of updating, I get a circle with three sequentially blinking dots. When I attempt to navigate awayy from the "network" button, the screen does not change. Within a minute or two, I lose all internet access and my Router completely resets. I am ususally offline for 5 minutes or more after this. In one instance (a few months ago) I power cycled my modem a number of times and finally I had to call Comcast for assitance and they had to reset something on their side of the network.
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