Upon receiving a 410 response code, notify the user their wallet needs to reconnect

[aaroncox]

Users who have a pending signing request, and subsequently perform another action that queues up a second signing request, will receive a 410 error code on the request.

We may want to catch this 410 and display a useful error to the user that they should start/restart/reconnect their wallet to receive the pending requests before performing additional requests.