Wow that = node connected to your LFO is always very tricky!!
Iff vvvv misses the exact frame, for example high speeds, or you are tweaking some values, the patch doesn’t work anymore.
Monoflop is triggered by a BANG, like many many other nodes.
So it is best to use a >= (Value) and a TogEdge (Animation) (produces a bang) combination to trigger the Monoflop.
But I thinmk it is way better to skip that Monoflop node.