Well, you do have enough miles and age to where things will start wearing out on you. Have you replaced or inspected any of the things I mentioned before? Motor mounts and drive shaft "flex disc" (guibo) would probably need to be replaced soon.
Tires that are out of balance can cause vibration at certain speeds as well as warped brake rotors... ???

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2004 X5 4.8is Imola Red-228K ZF-GA6HP26Z-Sold
2006 X3 3.0i Mystic Blue-175K, ///M pkg 6-Spd Manual- Trading in 6/10/17 for a Mini too!
2003 Silver X5 3.0- sold
2000 VW Beetle 1.8 turbo-165K- Totaled 9/11/16