20072500HD

Hey there, I just bought a 1995 2500 with the turbo 6.4, 4x4, ext cab. Since I have bought it I have been driving it every day, twice so far it has having an issue, it started out driving normally, and then ( usually on high way on cold days) it would shift into 2nd or 3rd gear and would not shift out if that gear. If I pulled over and turn the truck off and back on it would be fixed. Anyone have any idea what would cause this? Anyone have this issue before? Thank you for any help!!