Going on my third axle...help!
 

I bought a 1999 civic ex a few months ago and had to replace the driver cv axle. took it to a shop to have it replaced (I know the shop owner) Sound was gone and all was fine......Maybe 50-75 miles later the axle has gone out again. Its getting bad and i need to fix it soon. So my question is, What would make the axle go out so soon?? I was told a motor mount maybe? is this true? Please any help would be greatly appreciated.