What's the problem with Alastair Cook?

Simon Hughes, writing in the Daily Telegraph, says Alastair Cook's unusual dismissals in the Test series against Pakistan are a sign of a lack of form, caused, to an extent, due to a preoccupation with technique.

Despite his [Cook's] fine overall record, he does not imbue anyone with much confidence. What he probably needs is an outing for Essex at Twenty20 finals day on Saturday with instructions to forget about footwork and backlift and go and give the ball a thump. After failing against a good attack on two tricky surfaces, he should probably be given the chance to recover his poise in more benign conditions in the third Test at the Oval.