iPhone 4 won't stay connected to Airport Extreme

[Krio]

My iPhone 4 on 4.1 (never tried on any other software) just won't stay connected to my airport extreme more than a second. I've reset both, reconfigured, and nothing works. On the other hand, I'm typing this on my macbook connected to the same wireless router with no problems. Any ideas?

 

[Flynnstone]

Any luck?

I'm having the same problem.