I am curious if it is truely "marking" that he is doing. It is not uncommon for dogs to start a habit like that because it gets them attention albeit negative but anything is better then nothing.
Try taking your pup for an extra walk a day or tossing a ball for 15 or 20 min make sure he is getting lots of exercise and attention. If hes too tired to get up and wonder around hes too tired to piddle.
Having a JRT mix myself I completely understand how high-energy they are as you do. He may just be bored.
Best of luck
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