Arsenal have lost two games this week and both defeats were instigated by the failure to defend a corner early on.
Bolton's Abdoulaye Faye powered home a header in the 10th minute on Saturday and Brian McBride of Fulham did likewise after only five minutes in midweek. Arsène Wenger's side slipped to defeat on each occasion.
The Frenchman accepts Arsenal's marking was poor at The Reebok Stadium and they were cursed by ill-fortune at Craven Cottage. His solution is to ask his side to "play normal" and not obsess over the problem.
"We started quite well at Bolton and at Fulham," he said. "And then from the first corner - boom - goal.
"What can you do about that? Just play normal, don't make an obsession of it and focus defensively every time you lose the ball.
"At Bolton I concede we were completely guilty of not marking but at Fulham we defended well. It was just a kind of coincidence. Jens deflects the ball to get to it. If he doesn't touch it Flamini would have headed it out just behind him."
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