Used 2018 Cadillac XT5 Luxury AWD for Sale near Trois-Rivières, QC

my cadillac xt5 2018 with the bose sound system is acting up. when we play music from the radio it is just fine, but when it is connected via bluetooth or hardwire, apple carplay, sound only comes from the front speakers and worse quality. it sounds like it’s on a phone call but it’s not!! it worked just fine for years then, now, for a couple months it sounds so bad!!! we have tried different things but same result, when connected to a phone not great.