IOS 5 bug?

Using an empty scene on an iPhone 4S with IOS 5 using unity 3.4.2f3 and xcode 4.2 I find out that the Time.elapsed time goes like this:

0.033
0.033
0.033
0.033
0.033
0.033
0.033
0.100
0.017
0.033
0.033
0.033
0.033
0.033
0.033
0.033
0.100
0.017

And that keeps repeating. Why does that frame which takes more thime happen? It actually slows down my game visibly and that does not happen running on older IOS

Has anyone found the answer to that? I updated to unity 3.5 and I still have the same issue.