I find I learn things best when I try and explain the subject to others thus I made a mod spotlight for this, showing how to automate trains going from one teleport ring to another.
It's got a link to my friends blueprint as well, they say it's not perfect as you can see when I struggle with fluids. However I find that's a good teaching experience for myself.
I was playing last night and I noticed my acid train was spazzing out again. I am told the ring checks every 5 seconds, which corresponds to a clock count of 300, since then I modified one of the combinators in the blueprint to use 350 instead. So far, so good?
Yeah, after every 300 game ticks it is able to start teleportation due to how graphics rendering is looped.
However the circuit signal updates are run after every 30 ticks. If a positive signal is found, then the next time the teleporter can run, it will (even if circuit signal turns off just after the activation). May be releated.