My E70 X5 4.8i is almost four years old. Only 26K miles.

I've been doing a lot of traveling (by air) recently so haven't been driving it that much. I definitely notice 'clunking' sounds from all four wheels when driving around though. Sounds a lot like a 12-year old Honda, that I had 20 years ago, that needed new CV boots but can't believe that is the problem.

Going to have to take it into the dealership before the warranty expires but anyone experiencing anything similar? I do have the 20" run-flat tires (which obviously don't make for the smoothest ride) but it's more the 'clunking' sound that is so obvious.