does the battery being disconnected causes transmission problems

yes.anytime you unhook a battery on vehicle,you must first unhook the neg(black)connector first,then the pos((red) connector last.when hooking back up,pos first,neg last.you should also hook up a battery saver before unhooking battery,to keep power on the pcm to prevent memory loss on it and also module for transmission and various other modules,valves,sensors..Erasing the PCM's adaptive memory may also affect the way the transmission shifts and feels. The transmission may not feel the same until the PCM or transmission control module relearns the shift adjustments. This may take 50 to 75 miles of driving.