Electrical problem 2003 H2

[deathshead67]

Yesterday I pulled into my driveway and i threw it into park real quick. I noticed that all of the lights in the Hummer H2 2003 never came on. I went to start the truck and everything was dead (no power). I tried the ignition again and the truck started but all of my preset stations were erased. The next morning I go to start the truck and its dead. Try it again a second later and the truck starts. Then I take off and while driving on the highway the radio and blower went out and then came back on.(I also think the seat adjustment rebooted also). The truck never shut off, I just lost power to the circuit. Now its happening all the time, I park the truck put it in park get out of the truck go to use the remote to lock the doors and behold ...no power. I get in the truck and it starts a few seconds later. What gives? ignition switch,neutral switch, loose wire or bad relay??? The only thing I did last month was put in HID's but the battery is not dead and i don't need to jump start the truck.