MacBook Pro loses WiFi

To start, I suggest trying the following things:

• Temporarily remove the wireless mouse dongle from your Mac. Just use the notebook's trackpad for the mouse during this time period. Does the issue still persist? If not, then we narrowed it down to the dongle. If it does, then go to the next item. (If it's not the dongle, you can reattach it as desired.)
• Even though the wireless gateway is nearby, be sure there are no objects (especially metal ones) between the notebook and the gateway. If there are none, go to the next item. (We can also take wireless performance quality measurements to verify any issues with the wireless signal that your Mac is getting from the gateway ... but we will hold off for now.)
• Completely power-down & and then re-power-up, the gateway. If the issue does not return, then we ruled out the gateway or its configuration. If it does, then the gateway needs to be troubleshot further.

Please go through these items and report back your findings.

FWIW, I have used, and continue to use, a number of Logitech wireless mice/keyboards. They do not rely on Bluetooth, but use a propriety Unifying signal. However, this signal does operate in the 2.4 GHz band and can interfere with the wireless card on your notebook, regardless of which side you plug it into. I also find that these Unifying receivers do not provide a very strong signal and can easily be blocked by objects. For example, with my Mac mini, which resides inside my desk, I use an extended USB cable to place the receiver outside of the desk so that my Logitech keyboard/mouse can better access it. I found without doing so, that both devices had connectivity issues. Maybe something to try to move the receiver farther from your notebook. At least, I think, it may be worth a try.

On the off-chance that the issue could be the wireless gateway, how old is it? If it is 2 or more years old, and especially if you rent it from AT&T, i suggest that you request that they provide you with a new one.