Those to problems can be a problem with your drives, doesn’t matter how many drives you have, they can be failing or that the PCI card or mother board there is a problem.
For trouble shooting
– Does this happen on older projects?
– What about projects with a different codec?
– Do you have a FW800 drive you can copy some footage to and test it, also log and transfer some P2 cards to this new drive.
– Transcode some of the clips to ProRes and test it in a new project.
This will help determine if it is a drive, system issue or a codec issue.
[Dave Gorrie] “Timeline is set to Safe RT and Dynamic/Dynamic for playback setting, with audio waveforms turned off! “
Because of this I’m assuming that you are using FCP, but you never state that.