Most calls start the same way: the door stops mid-travel, hangs crooked, or one bottom corner sits noticeably lower than the other. Sometimes there's a loud pop or bang first - that's usually a roller jumping the track rather than the spring, though the two can look similar from the driveway. If the door was still moving when it came off-track, check for a bent track rail before you touch the opener again; a bent rail will keep throwing rollers no matter how many times you push it back into the channel.
The climate band here runs cold and severe, and winter is when we see the most off-track calls tied to ice buildup on the bottom seal or track. Ice can pin the bottom of the door for a second after the opener starts pulling, which is enough to twist a roller loose on one side. If you're seeing this in January more than July, that's usually why. A door that's merely stiff in cold weather is a different, cheaper problem than one that's actually left its track - worth telling apart before you call, if you can.