I have 4k composition.
I'm viewing at a third resolution.
I have a single letter on a text layer with an adjustment layer above that has Light Burst on it.
I've keyframed the center parameter for the Light burst to move over 8 seconds or so.
If I view or export at a third resolution there's no problem and it acts as it should.
If I view or export at half resolution there adjustment layer disappears at one point for a couple frames.
If I view at full resolution there are multiple drop outs.
I've tried a new composition, and dumping cache. No change.