Hatchback/liftgate Lock problems of the 1997 Chrysler Town & Country

There are 2 pneumatic cylinders that hold the rear hatch door in the open (lifted) position. Recently, the bolt that secures one end of it to the vehicle broke and the door fell and hit me on the shoulders ( it is quite heavy). I was not injured and I bought a new cylinder with the intention of replacing it myself but, instead, took it to the dealership and they repaired it. While I was at the dealership I talked to another town and country owner who told me he had to have both of his cylinders replaced because both of them broke at different times. Are these isolated instances or is it a common safety problem that should be addressed?.