2013 prostar factory radio glitch

Well dealer was no help on this due to navistars policy. i have factory radio that is buggy. first off when the ignition is on the radio is not powered at all. So you push the power button and it comes on and says initilizating ( sirius) some times it stays on for an hour sometimes only 30 or 40 minutes then goes off. it has power because the clock stays set. also the steering wheel buttons dont work it either. Thats on a good day. On a bad day it you goes on and off constantly all day long like every 3 - seconds. sometimes stays for 10 seconds sometimes not.
Now the shop just did the standard navistar test and said there is nothing wrong with the radio..... So there must be something wrong somewhere in wiring i am guessing. Also i unhooked the bunk radio to eliminate that possibility.

 

actually now that you mention load shedding that is exactly what happened just before this all started. it worked fine until i went to start the truck and it went to load shedding and hasent worked correct since then. is there something i can look for to correct this? i pulled the breakers numerous times
update. the radio is good they tried it in another truck and works fine. one guy said might be the body controller. any thoughts on this? also now they got my windows so they dont work now.