Thatās weird, is it possible to share the project and the FBX to the original animation please?
Iām just thinking out loud, but I wonder if this can be related in some way to PlayCanvas resampling FBX animations at 0.1 second intervals. So, your imported animation may not have keyframes where you actually think they are and if the playback glitches in some way - like maybe a frame gets skipped because playback speeds are inconsistent - the animation stops in an unexpected location.
This may be unrelated to your problem, but knowing that the animation imported is probably not identical to the original animation (most animations are created at 30 fps, 25fps, or 24 fps, not 10 fps) might be helpful.
I wonder if adding a second keyframe for the closed position at least 0.1 seconds after the first closed keyframe would help. That keyframe should occur while the zippers are zipping, so Iād think it wouldnāt hurt anything.
Itās a bit odd as it seems to be something in the middle of an animation 
Yeah. It seems like thereās a missing bit of info somewhere. Starting by looking at the original animation seems like a good idea.
Thanksļ¼Iāll try your advice
I created a new test project sharingļ¼which has FBX ļ¼this is link https://playcanvas.com/editor/scene/1007102
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Well, no insight or solutions from me, but I can confirm that I see the problem using two different browsers (chrome and firefox) and that the FBX file looks fine with the case closing on keyframe 15 which is a multiple of 3 (for 10fps from a 30 fps file). Also many āclosedā position keyframes afterwards.
Further, the gap for not fully closing varies. I think Iāve seen four different gap widths.
Slowing down the animation and so the keyframes are twice as far apart, re-importing and running at 2x speed shows the same problem. Also, running at different anim speeds shows the same problem.
It does appear that if I load up my GPU by running a different PlayCanvas project (the one I should be working on now) in the background at 4K size, the error seems to occur more frequently.
It is also worth noting that the failure to sometimes close completely occurs in Editor as well as the launched app.
And I tried two more things just on a whim and no joy for them either. I closed the case by an extra half a degree (0.5 instead of 0.0) and I deleted all the extra keyframes for the closing case that sit between frame 15 and 60.
Thanks for your help, I added some key frames according to your suggestion, and got a normal animation, but after testing I found that this is random, and the second time I try to add, there will still be problems that cannot be closed.
@Rex Not sure what the issue is but converting it to GLB using our beta FBX -> Feature seems to work fine. We are looking to stop doing FBX -> JSON conversion VERY soon.
Iāve added you to the beta list for FBX -> GLB feature. Enable it in project settings -> Convert to GLB
Thanks for your help, but āwang_rexā is my main account, please add this, thanks
https://playcanvas.com/wang_rex
Done!