I heard this earlier today from another user about PRV controller view seeing a stutter.
im wondering now if there was a new windows update that may have disrupted something or vice versa,
there is an update you may be missing.
are you all to date on windows updates ?
Video card updates ?
I believe sonar uses a different graphics engine to produce its views.
Reaper and Studio one are not on the same open GL as far as I know.
these updates are critical to performance and every day use.