you will find the camera 'flicker' at times too.., until it becomes 'crippled ' is the best way to put it.., the fix is.., click on the '4 screen view' and back to perspective.., should get you threw most problems.., but even the best of them have to restart maya from time to time

or you might need to change the camera clipping plane from 1000 to 10,000

take care mate