It's the junk clutch and pressure plate Ford installed into these cars. Banging gears will often get the same result. At this time there is no fix from Ford as they know about the issue but have yet to issue a TSB about it. Supposedly when I talked to an engineer from Ford he said they know about the issue and are working to get it resolved.
He stated the fix should be out around now.
99 Chevrolet Camaro Z28 M6 - 6.676 @ 103 in 1/8, 10.512 @ 130.2 on street tires, H/C/I
93 Eagle Talon TSI AWD 5spd - Built 6 Bolt, 16G Evo3, HKS 272 Cams - under construction