Apple TV loses WiFi Connectively After waking up from sleep

My Apple TV, software version 3.0.2 (which gives us 1080P btw), works fine, until I put it to "sleep." Later, when I use the Apple TV, it says: "Not connected to the Internet." In effect, my wifi has disappeared from the memory of the Apple TV, and I have to enter the wifi network's password again on the Apple TV.
I have had this Apple TV for about a year; the problem appeared maybe one month ago.
I took it to the Apple Store after Apple Care Telephone Support consulted with engineers. The Apple engineers said it could be a hardware problem, and for me to bring my Apple TV to the Apple Store so they could diagnose it. But at the Genius bar, they put it to sleep and woke it up and it never lost connectivity every time. I suggested that as the Apple Engineers wanted the hardware looked at, why doesn't the Apple Store keep my unit, put it to sleep, and wake it the next business day? The genius bar refused, as the problem did not replicate itself at the genius bar. I told them that trying after 10 minutes wasn't enough. They should try it overnight, as I do (go to bed, try it the next day, only to discover that the Apple TV lost it's connection to the WiFi.
So for now, my work-a-round is that after a few hours, I have to reenter the password for the wifi. I've been reading threads about similar issues with the iPad, but I don't know if the problems are related (technology wise).
Bottom line: My Apple TV loses its connectivity after being in sleep mode for awhile. Nothing to do with the iTunes store or 3.0.2 as far as I can determine; if I don't put it to sleep I don't lose connectivity.

Thank you, Jamie Cox1. However, after rebooting the Apple TV, I lose my 1080P; it goes to 720P and takes about 5 minutes or so to reboot. Then I have to set the 1080P again. The good news is that the wifi returns But it is quicker merely to re-enter my password.
The problem remains: After a while of having the Apple TV in sleep mode, I lose connectivity to my wifi And while I have a complicated password (upper and lower case letters, numbers, and not a dictionary word), it still is quicker to re-enter my password than to wait for the Apple TV to reboot and re-enter the settings for 1080P.
Thanks anyway; if I only had 720P perhaps this solution might be enough - but I have 1080P.
I am working with Apple Care; I have reconfigured my wifi twice with Airport Utility, removed all interference (microwaves, cordless phones), and still the problem remains. Apple Care hasn't solved the problem. The Genius Bar at the Apple Store hasn't solved the problem. Re-booting does find the wifi again, but it takes a long time, and then I still have to re-set the resolution to 1080P. So I just re-enter my password each time.
And that's my update! I appreciate everyone's suggestions. However, the problem remains: after putting the Apple TV in sleep mode, and then later when I want to use the Apple TV, the Apple TV forgets that it is connected to wifi and I have to re-enter my password, or I can take some time and reboot the Apple TV but then while the wifi returns, the 1080P disappears.
Thank you everyone for all your suggestions
But the problem remains

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============================
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=====================
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This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, or by a peripheral device.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
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