03 Sport 6 cyl auto. Wondering whether tranny is shot or just loose bands. Can drive 2-4 miles (cold weather), then lose ability to accelerate. Park, wait a bit, then can drive a little farther. Rinse and repeat. Due to recent physical limitations, I can't work on it myself. Living in new area. Don't know local mechanics. Don't want to be suckered into expensive repair. I'd appreciate any insight.