How long have you owned them?
Did they just drop dead out of nothing? Have the movements been serviced before?
This is bad news indicating the VS3235 can't stand the test of time?
To clarify, one of my 126610s is a Noob with A2824, so it doesn't really belong in this thread. Sorry.
The other is a VSF, and it wasn't perfectly healthy according to my Timegrapher, so I decided to adjust the beat error (which I've done many times on other movements) and my tweezer slipped off the stud and tapped the balance spring. So the movement failing was my fault. However, the balance jewel retainer clip was not clipped in, and I suspect that was the case on arrival.