Hitpoint Detection Bug?

In newly created 88,2 KHZ Cubase 6.5.3 project, I imported 12 tracks of drums. Everytime I do that, in each track after 3 mins, hitpont detection fails. Any comments?

MacPro mid 2011, 8-core 16gb ram, Cubase 6.5.3, SSL MadiExtreme 64 with AlphaLink. UAD-2 DUO, PowerCore Express