I never have noticed any issues like described. Unlike most I bought a D7000 not as a replacement for my D300 but to fill my second camera position. The D300 is still meeting my needs for my shooting environment. The D7000 is supplementing the D300 by bringing lower light capabilities to the table. I will 2-300 frames in the course of 5 minutes when shooting my venue. With that kind of running and gunning I don't think the D7000 could keep up.