Reboot Loop

My Xs iPhone was a low battery, but working just fine before it restarted itself, but then became stuck in a loop from the apple logo to a flash of green and white lines to a blank screen. I see that a few other people have had this problem, but no one gave a definitive answer. Has anyone been able to figure this out? The soonest repair date in any Apple-approved repair store (including the Genius Bar) is almost two weeks away.