Hi 3dRaven,
thanks a lot for your input 
It’s very likely that there’s some fundamental limitation in how TSR is implemented.
When switching to TAA, I get the same effect, plus a lot of jittering.
I wonder if TSR might have some parameter which, if trimmed, could improve the final result.
The fact is that TSR works very, very well for 99.9% of the time. Therefore, for the vast majority of frames, the information is there and it’s valid.
It just glitches every now and then 
I wonder if these glitches could be avoided somehow, maybe in a future TSR version.
Maybe the root cause is in the accuracy of the velocity vectors? Still using floats instead of doubles? I wonder