2006 z4 3.0si shifting issue

[johnvandyne]

So I have had a 2006 z4 now for a year, love this car, it has right at 70,000 miles, but the last couple of times I drove it, it's like the transmission gets "confused" mostly at lower speeds, taking off. I initially thought the engine was sputtering, but it's like it will quickly shift up, then back down. To me, it seems to be an electronic issue, it of course has sport mode, this is happening with sport mode off, I am afraid to drive it in sport mode right now, curious if anyone else is familiar with a similar issue