What is up with Dhoni's keeping?

Dhoni was never the most spectacular of keepers but he was always energetic and reliable. In this series he has been extremely reluctant to go for catches and even his normally stellar stumping skills have deserted him. Is he carrying an injury or is he just tired? I wonder if India should seriously consider a replacement to Dhoni for test matches and lighten the load a little.

There have been no reports of him nursing or carrying an injury,with that being ruled out,the only reason he has been below par has been abnormal swing and uneven bounce.He has been so acclimatized with the flat Indian pitches that this seems alien to him.
If ever we need to replace Dhoni,we have to look for a reliable WK batsman and none fit the bill right now..
Saha performs once in a blue moon and DK's keeping sucks..
Ojha is just a newcomer and can't be entrusted with such a big job..
Samson might be given the nod,but he needs to mature some more..
Plus..Who will handle the captaincy post..??