I'm sure there are dozens of people playing on here, can anyone replicate the OP?
I experienced the same problems in the same building on Xbox One instead of PS4. You can provoke the framedrops by having lots of light sources in your FOV and while the lighting looks awesome it seems to tax the GPU quite a lot. Especially the moving lights in that building. Other buildings and dungeons were flawless though so far. (I'm just 5 hours in)