2012 Silverado 1500 crew cab, 2WD. Over the life of the truck, Sirius/XM radio has been slowly but steadily increasing the instance of cutting out ("no xm signal" alert on display) with the slightest interference - passing under telephone poles, etc. It did not used to do this, nor does our other vehicle do this.

Other forums have discussed a GM service bulletin for a known issue and also the potential of failure of the antenna, and/or corrosion in the antenna connections.

Before I go trying to lower the headliner and replace the antenna, has anyone had this issue or have any knowledge of a potential GM service letter?

Thanks,
Ken