Bachmann class 66 non mover

[David62]

 Hi Guys!  just discovered this morning my Bachmann class 66 with 8 pin to 21 pin R8121 TTS had its lights on  when the power was turned on (Elite)  but could not get it to function sound  running direction lights horns etc  or move either way, i reprogrammed it on the programming track and  the locos cab lights flashed on and off when reprogramming  it never did that before?.. I have had the decoder for 6 weeks now  without a hitch... what the H---  is goin on????