Often when I start my '15 TH and put it in reverse, there is a long lag before the back up camera view comes up on my display. (I get the legal disclaimer asking me to agree, a screen that says my Sirius XM is acquiring signal, and, finally the backup camera display comes up.) Is this "normal" (it sure is annoying)? Is there anything that be done to minimize or eliminate the delay? I would have expected that the BU camera would have priority over other displays when the TH is in reverse.