Remote key2 coded key1 lost prog. key1 reprog key2 lost prog. Any explanation?

[goldenbird]

Both Remote keys were programed. When coding new preferences through scanner while key2 was in ignition, key1 that was away with my wife was found not operational later. I reprogrammed my wife key1, it became operational again. Second day when trying to remotely open the door with my key2 it is found that it lost programing. Reprogramming it and it is working again. Any explanation? it is weird. Don't even know if my wife key still ok or not