Error "could not be downloaded at this time"

My iPhone and iPad I have problems downloading and updating apps.

I keep getting the error message "could not be downloaded at this time" with the options "done" or "retry".

It doesnt happen all the time but it happens a lot.

At first I thought it was the internet connection in the house but the same thing happens when I'm connected to the wifi at work or to the wifi at friends houses.

I restarted my iPhone 4 times once and then it finally worked. I cant do this all the time though. lol

Is this a known issue? Is there a fix?

Any idea?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References
www.mac-forums.com/ios-and-apps/274507-error-downloaded-time.html

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