It seems to me that this usually only happens when he's losing or playing badly, so he starts getting frustrated, thereby shifting his focus to himself which in turn will only make him more susceptible to being distracted. If he could get on top of this (and I think there has been some improvement recently) he'd make life a lot easier for himself - and us!
Actually I was thinking Andy tends to lose his focus when he’s in a winning position rather than losing position. And I am also talking about all sorts of distractions. I think it’s been notoriously known that he’s a slow starter to begin with, which could be a distraction itself, but I noticed, he gets awfully distracted after beating a top player. Like for example, last year at Rotterdam, he beat Nole in two easy sets but then got beaten by Federer in the final. Same thing happened at Shanghai last yearand then at the AO this year. Even Lendl wasn’t very pleased about it as he’d mentioned in one of his post AO interviews, that the ultimate goal is to win the title, who you beat on the way, doesn’t matter and shouldn’t matter. It’s understood though that Andy was physically compromised at the AO and also, his history against Federer goes way back, so there was always this danger of him getting a bit distracted after that win. But I’d say, as a whole, it’s still a bit of a problem for Andy – the other three have overcome it and I suppose Andy’s on his way too.
Given all that, I really like his Olympic results where winning the Gold medal was the most important thing for him – who stood in the way didn’t really matter and as a result, he was able to beat both Nole and Federer back to back. I guess I’d like to see that kind of mindset from Andy as a permanent basis going forward.