general problems of the 2001 Volvo S60

Pirelli four seasons p6, tire size p235/45 r 17, dot no. Xbcuc236, I have had three instances where the tires have experienced sudden deflation while parking along a valley curb. No damage to the tires but had to have them remounted and balanced. I have also had two instances where the tires had sudden deflation while driving, once at 35 mph and once at 70 mph. In both instances, I was not immediately aware of the deflation and the tires were ruined as they were driven flat. There was no other damage to the tires and there had not been any impacts to them prior to deflation. The tires were provided as original equipment on my 2001 Volvo S60.