Not only are the motor mounts on Chrysler Pacificas prone to failure, they have failed at such a high rate that–according to someone who posted a few weeks ago–there are many thousands of them on backorder.
Since you have such a new vehicle, yours will be covered by warranty–whenever they actually arrive at the dealership. Owners of older Pacificas are essentially screwed unless Chrysler owns up to this mass defect, or unless NHTSA orders a recall.
For everyone’s sake, the OP should report the problem with his/her vehicle to NHTSA, via their website.