My 750LXI sedan has a problem with a frequent need to change tires. It is very strange that every year since I bought it in 2011, I have had a nail found on the rear tires (2x in the right side and 2x in the driver side). I have never had nail problems in many other cars that I and my family have owned. The 750LXI came with run-flat tires. This is really weird. Now I have another low pressure signal coming on (exactly a year since I replaced that tire) and I will take it in to the dealer tomorrow. I wonder if it will be a nail problem once again. Has anybody had this problem? I am wondering if the RF tires are more prone to nail punctures. Is it advisable to replace tires to non run-flats?