[bp83]

I've been experiencing a juddering that comes on for a short period, and then goes away when driving. It feels like I'm going over a series of bumps in the road a bit like the ones they put before roundabouts to make drivers slow down. Have checked the tyres and their pressure is fine.

Issue has been happening on and off for the last month, it lasts for about 30-60 secs and then goes away again.

Any idea what it is?

BMW 330I Convertible 2009

Thanks
Ben