Does this ever happen to you? At a gig, playing a solo you know really well, you lose your way, wander around for a couple of bars till you recover, then finish out ok. Happens to me 3 or so times a night. Most people don't notice, I do. Root causes: good looking women; mind wanders to something else (like the TV over the bar); brain spasm; who knows? How often does it happen to you? What are the causes? Especially the pros.