In reply to druss:
It was an issue for some people a few months back, including me. I found that logging out and back in did seem to help but not instantly, so it might get there. I know Paul was looking into it but I'm not sure whether he cracked it. Apparently if you log routes when you're not connected, it should try again each time you launch the app but that didn't seem to be working sometimes.
Not sure whether it's still an issue because I'm unhealthily obsessed with keeping my logbook updated so I gave up doing it through the app.