tegra radio/clock issue

just yesterday i was driving and i noticed the clock wasnt on, radio was fine. stopped somewhere, when i went to leave i started the car up and the clock was still off and when i turned on the radio it said code, like i had disconnected the battery. so i reset all that, and then while i was driving the clock just turned back on by itself. this morning when i went to leave, clock is off again, and when i started the car it said code on the radio again. so i entered my code radio works fine. shut the car off, waited about 5 min, turned the car to the on position and have to enter the code again. its quite annoying, any ideas where to start? i have the radio out, i’m checking for any open wires or anything, and i’m going to pull the clock out next. the memory fuse is good, not blown. not sure where to go next.

96 GSR
factory head unit

check the 7.5 amp back up fuse in the underhood fuse block. (unless thats what your referring to as the memory fuse)

http://www.redpepperracing.com/technical/d/21082-3/aft.png
http://www.redpepperracing.com/technical/d/21075-3/afm.png

yeah i checked that. actually its fixed now. i checked that fuse and didnt see any break or anything in it. but i figured let me replace it just to see whta happens, and sure enough it fixed it. must have been a tiny tiny break in the fuse element that i just couldnt see.