Yup,
It's odd, the first play through on ultra settings I was getting pretty good FPS at all points bar the odd hectic fight with a lot going on.
But on my second play through on game+, some area's are really bad to be in.. dropping to 30's then back up to 130 and kinda up and down.
Even lowering the settings hasn't yielded much. It seems to happen quite randomly. Today I played for aboot 90 mins and no real issues, but log in later tonight/tomorrow high chance it will happen again.
Although the port over from console has been great, there still seems to be some issues