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Dell specs for your monitor are somewhat confusing, at least. The P2715Q (without the t, yet the manual states otherwise) was actually unable to do 4k @ 60Hz on either Hdmi or Displayport, only 30Hz was available.

You should write which connection you use, which graphic card, window manager, X or Wayland, and how do you read the settings actually used for your display. I suspect the box starts at 60Hz and then is unable to sync because it's not available. Eventually it settles down at 30Hz.