seems to bug when opening a menu, destination, vendor, or maybe just being in the tower. Game typically runs at 115-ish FPS on my machine. Gets locked to 30fps. Got it fixed once by enabling and disabling framerate cap but mostly that doesn't fix it. Tried variations of enabling/disabling v-sync, nvidia reflex, frame cap... tried changing frame cap amount, nothing works. Restarting the game "fixes" it but it comes right back at the same trigger spots. After a long time away from this game I wanted to try the dungeon but if it bugs at 30fps I am gonna log off.
Had that happen, did you check to ensure your game bar was not set to its annoying "Game" mode? I've noticed it causes issues with framerate(locking to 30 or 60) and causing voice chat in-game to not directed to the correct output.