After iPhone goes sleep, can't connect to wifi unless I turn it off and on

I'm having an odd issue. I've had my iPhone for about 1 month after owning an iPod touch. Both my gf and I have purchased iPhones and hers does not have this problem.
When the phone hasn't been used for a while (ie in my pocket) once I try using it again, it won't connect to the wifi. If I go under settings, I see a checkmark next to the wifi, but the 3G icon does not change to the wifi icon. It basically does not want to connect, however if I turn off the wifi and back on , it instantly connects. This happens with any wifi connection (at home or at work)
The same thing occasionaly happens to the 3G, it says I'm connected to the 3G network, but I can't use the internet at all. At this point I have to reset/reboot the iPhone. Then it works
It's a common issue that seems to be both affecting the wifi and cell network.
I'm not sure whether the issue is hardware related, or software. I'm thinking of restoring the iPhone using iTunes, but I'm not sure if it will back up everything like the Cell network settings and everything.

iTunes creates and maintains a backup for your iPhone which is updated as the first step during the sync process. The backup includes iPhone settings including wi-fi network settings for each wi-fi network you have connected your iPhone with along with other data such as email account settings, contacts (which should be synced with a supported application on your computer), 3rd party app settings and data created and stored by a 3rd party app, photos/video in your iPhone's camera roll (which should be imported by your computer as with any other digital camera), SMS/MMS, notes, and your selections under the various tabs for your iPhone sync preferences. This is not a complete list.
When restoring your iPhone with iTunes, there are two options. From your iPhone's backup, which is the default selection, or as a new iPhone or not from your iPhone's backup which must be manually selected. When selecting Restore, you will be prompted to update your iPhone's backup which you should do. Before doing so you should import any photos or videos in your iPhone's camera roll and sync your iPhone to update any data kept synchronized with a supported application on your computer such as contacts and calendar events.
If there is a problem with any of the data included with your iPhone's backup or a problem with the backup, restoring from your iPhone's backup will also restore the problem, but try this first. If no change, try restoring as a new iPhone or not from your iPhone's backup.
If no change after that, more than likely your iPhone has a hardware problem. You can call AppleCare or make an appointment at an Apple store if there is one nearby.

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http://support.apple.com/kb/ht1430
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After iPhone goes sleep, can't connect to wifi unless I turn it off and on

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