It happens almost all the time not specific to the project. It got somehow a bit better with 3.5 but might be psychological effect I don't know 🙂 ( Did not checked today's update though )
I attached my mac specs so I hope that helps. I'm using Apple's magic mouse and using 3 monitors ( saying because it might be a focus issue or sth? Not sure ).
Let me know what kind of info you need so I can provide.
Thanks,
Burkay