2018 JLU Death Wobble

I have the 4turbo for reference. I loaned the jeep out for two weeks while friends truck was at the mechanics. Coincidence perhaps??? Got it back last night. Drove it today and for 3-4 seconds at 50-55 mph going at slight incline it wobbled. Total of three times in the same spot in way out and in on the road. Pulled over to visually inspect and nothing. First time it has happened! I’ve owned an 2dr jk and never had it happen. Before I assume, question and acuse him of possibly hitting a curb or driving it improperly in 4 wheel drive. Just seems like something is loose. Even at sudden breaking it locked and but jolted going 5-6 mph.I’ve read on here at inter places of the causes and fixes.. just seems like too much to be a coincidence, but may very well be. Any insight, advise or trouble shooting greatly appreciated. I