Long long time reader, first time poster.
2015 QX80, 160k - no history available (purchased at auction).
Symptoms: when accelerating aggressively around 40-45 yesterday, felt a sudden jerk, then a combination of high rev and what felt like trans slip. Happens every time I recreate the same conditions. Doesn't happen at low speeds, even when I floor it.

No DTC other than when I first got the car and it had camshaft position sensor intermittent, which I cleared, drove well over 100 miles and never showed up again.

Trans fluid is correct in volume and quality, considering doing fluid/filter as my potential first step.

Any thoughts are greatly appreciated.