Has anyone had any problems with Dunlop tires?

I purchased 5 Dunlop Direzza tires for my Audi A4 and within the past 30-40 days, 4 of the tires have blown. I take the tires back to the tire shop where I purchased them and they replace them but cannot give a reason for the blowouts, has anyone heard of this or have any suggestions?|||I had some years ago and they were great, but that doesn't mean yours are. If they are that bad I would tell them you want them replaced with a different brand. There has to be something seriously wrong to go throught that many tires. I have not had a tire "blow" in 30 years and I have 3 cars. The last time I had one blow was when Firestone had to do the big recall back in the 70's. They had a big problem too and had to recall them all.