After using the sleep mode on my desktop Win 7 machine, I always find I can't connect to my home wifi network.
I can check the settings via Control Panel >> Network and Internet >> Manage Wireless Networks.
Right click on the network, go to Properties >> Security, and then Show Characters (for the stored password).
I find that all alphabetical characters have changed from lowercase to uppercase! Changing them back allows me to connect again (within seconds).
The Security type is set to WPA2-Personal, and the Encryption type is AES.
Any ideas what's causing this?