First time for me. Weather was nice, so pulled our CLK500 out of winter hibernation and went for a short drive. On battery tender during winter. Car started fine. Drove for a bit. Stopped for an errand, turned off the car. Started fine again. Drove home, parked in driveway in anticipation of another jaunt. About 30 minutes later, went to start and it cranked but didn’t start. Tried several times. Same. Crank, no start. Took our other car. When we got home about two hours later, anticipated pushing it into the garage but thought I’d try to start first. Fired up fine. No recent service. No strange noises when out and about. No odd engine sounds. Any ideas??