After effects preview renders a few frames at a time and resets
There are some posts about a simlar issue related to audio devices, and others related to RAM. I ran into a similar symptoms tonight, related to RAM (sort of). I precomposed a clip to add a warp stabilzer effect to it. After some work, the footage in the precomp had a warp stabilizater effect, and the precomp as a layer in the original comp also had a warp stabilizer effect, but it was toggled off. The on/off toggle made no difference because there was still some sort of recursive created that must've just slammed RAM thank you ma'am every few frames (128 GB RAM). So if the issue shows up suddenly, in the middle of your work, it could be a recursive like this.
