There is a great saying that goes sometimes you have to go back to go foarwrd.
he may just be switching his learned skills from short term to long term memorry.
Start at the beginnning and train it again.
each time it will get faster and easier to get the reults you need and it will stick at somepoint
Jl
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"The truth about an animal is far more beautiful than all the myths woven about it." Konrad Loranz |