2001 Trans Am - Elec Issues Please Help

All grouped together, my radio, power windows, and convertible top alternate between working and not working with no rhyme or reason at this point. I did have the alternator checked and it checked out ok. The radio is obviouly the most noticable since it goes and and off.

The power to the radio goes off completely, as the time display goes blank as well, as opposed to just turning it on and off, which leaves the time displayed.

Any help you could offer would be greatly appreciated.

thanks