intermittent bumpy ride

[Kisu_san]

BMW X5 E53 2002 3.0i Petrol, Auto transmission, 162,000 km reading
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Today i was travelling in my car at a 100 kmph, suddenly I experienced patchy /rough ride. Felt vibrations on steering wheel. I was in a tunnel at slightly bent to right, that time. Thought it must be road. But after I come out of tunnel also it was same for few kilo meters and it was okay then.

I had no error messages on display, nothing.

I experienced the same, some time ago, in a different tunnel it was also curve like tunnel.

Now car ride is smooth.

1. Any idea what it could be.
2. I have not changed transmission oil, I know BMW says its for life, is it better to change now?
3. What about wheel alignment.

Any ideas, experiences, suggestions...pls share.

Thanks in advance...

[Razor0368]

did you check power steering pump? or maybe it is just a steering sensor