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Guessing no codes? How does the transmission fluid look? Maybe a fuel or fuel pump issue, seen some weird stuff happen with gas issues. If you have a scanner capable of capturing live data, might record a trip and see if you can catch the data when the issue occurs.
Random speeds and not under load, would not think it likely to be a motor mount. Be sure to report back when you figure it out, will probably help someone.
Nice to see someone with one of these over 200,000, a little over 160,000 on our 2012.
My 6 year constantly asks why. What adults can learn from 5 and 6 year olds, to listen with your ears and mind open. Hard to learn when you don't listen ......