Mine does that , 22 F150 3.5 Lariat, if I let off it immediatly stops doing that and generally can get back in it and it wont do it. If you have the turbo gauge on you can see it fluttering up/down. its annoying and when I had it in the dealer said they could not reproduce, it doesnt happen all...
My phone disconnects from sync in the exact same spot while driving to town, it is a "hard handoff" between cell sites that fall in between "markets". Your phone may not go out of service but it may loose "data" service in which you wont notice. Now this is a real pain as you prob noticed many...