Why does my router disconnect every time I sleep the computer? Why did this only start to happen recently?

Why does my router disconnect every time I sleep the computer? Why did this only start to happen recently?

Actually it does with Ethernet too: http://support.apple.com/kb/HT2412?viewlocale=en_US&locale=en_US
What happens when the Mac goes to sleep (not just into idle mode or display sleep)?
On all Macs:
The microprocessor goes into a low-power mode
Video output is turned off, and a connected display may turn off or enter its own idle state
Apple-supplied hard disks spin down; third-party hard disks may spin down
On portable Macs:
The Ethernet port turns off, if applicable (see note below)
Expansion card slots turn off
The built-in modem, if present, turns off (see note below)
An AirPort card, if present, turns off (see note below)
The USB ports only responds to the power key on an external keyboard (see below)
The optical media drive, if present, spins down
Audio input and output turns off
Keyboard illumination, if a feature of your portable computer, turns off
But see the note about selecting, "Wake For Network Access" in Energy Saver preferences.
Note: Portable computers have no network connectivity when in sleep mode, but can wake if the Energy Saver option "Wake for network access" is enabled. If you wish to use file sharing or don't want to interrupt your Internet connection, you should not manually put the computer to sleep, and you should drag the "Computer sleep" slider to Never.

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