This usually happens randomly, but every now and then, Navigraph SimLink keeps logging me out during the flight, losing the ability to track my flight on the Navigraph app on a second device. While I can try again and log back in, the login page opens the web browser, taking up valuable memory space, in addition to being a very annoying procedure.
It seems that this is also occurring at certain points of the world, such as between Vancouver and Edmonton near waypoint ROMRA on airway Q949 (I did this flight three times and it occurs there every time). Also, the internet did not fail out of all occurrences of logging out.
This is extremely annoying and must be fixed. Add the ability to permanently keep logged in while in flight.