i just got a atlas GP40 DCC loco and am haveing some trouble with it . it runs fine in dc mode but when put in dcc mode it gets all funky on me. when i put other locos on the track with atlas decoders and try to mu them as soon as the other loco gets close to the GP40 it takes off down the track even if its set in revrise it moves forword away from the other loco. but heres what stumped me it only dose it with atlas decoders i have a number of diggi traxs decoders in locos and it runs fine around them it just seems to behaveing a problem with other atlas decoders. any thoughts or maybe a fix to this porblem ?