Desperately need help!!!

I have a 2 week old HTC one X. The first time i got an update notification, i updated it via wifi and it worked fine.

Now that i'm getting another update notification, when i update it via mobile data, it says paused , network was lost try again later something like that - while i can update apps of larger files using mobile data at the same time!

When i try with wifi - it takes just toooo long. Its a small file of 1.25mb and the internet speed it really fast. I wonder why the delay with wifi and pauses with mobile data

Please help