I just installed an aftermarket radio on mt 2007 Trailblazer w/ Bose and when I turn the ignition on the radio sound stops after 10 seconds. The only way it comes back on is to turn the switch off and back on again. Also, the power doesn't stay on in the accessory position unless the driver's door is open.

 

Who did the wiring? Did you use a wiring harnas from a specific vendor to connect to your TB?