Hint: Play barefoot

My time away from the table leads me to believe that the memory is an interesting thing. You forget the good habits and remember the bad. The muscle of the mind learns to recognize patterns and keep running tallies, but without practice that reflex will atrophy. 

Counting is crucial. One way to get it back is to count outloud as each card is played. 

Take note: This practice may be better suited to computer bridge than live.