Not at all. After dealing with my own trans issues, I am not surprised in the slightest. ZF fluid should only continue to be used on a meticulously maintained transmission. Fluid every 60-80k miles depending on usage according to zf.

That said, I would never refill a trans with zf fluid. I am currently running pentosin, liquid moly, and Valvoline in 3 different zf transmissions. Have tried all the fluids, zf, unscientifically, was the thinnest. And again, unscientific, but I think the weak link in zf autos. But take that for what it's worth... Some guy's opinion on the internet.

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)