I have a 2015 Suburban LTZ with MyLink. The radio has been working fine until about a month ago. Now, there is VERY poor radio reception except for XM. It will only pick up 2 or 3 stations that are pretty close. On the other hand, my truck (sitting right next to my Suburban) will pick up a ton of stations. I have checked all of the fuses and made sure the two connectors that connect to the antenna in the rear passenger's window are connected well. Does anybody have any ideas of other things I can troubleshoot?