For those of you with the sirius radio hooked up to your factory nav, has anyone been experiencing CONSTANT no signal messages? Every time I go under a bridge (even if its at 80 mph and the bridge is just a small overpass) within 3 seconds the radio cuts out EVERY TIME and I get a no signal message and then It comes back on. Its so annoying with all the bridges and overpasses on Long Island I cant make it through 1 full song. I thought these things had a buffer or delay to stop this. Any Ideas?