Entry door squeaks while driving

[KenAK]

I have searched for report on this but did not find anything so here we go.
When driving on some roads with bad expansion joints our entry door squeaks so much I want to scream! Once we tracked down the source of the noise we tried a few things to eliminate it. The one that works for us was with the dead bolt closed we would open the door latch causing the door to rely on the dead bolt to stay shut. The noise went away and driving was a lot less stressful. This is most likely a warranty issue but I wanted to know if anyone else has this problem? I had some ideas on how to fix it but DW says don't do anything until we talk to dealer. Ideas?

[ALJO]

Start with putting some graphite liquid in the lock and bolt. It wouldn't be something to run to the dealer for. Fuel isn't for free.....