"Source too slow"

I have my N2 running the stable 9.2.1, I recently did a soft reset because things were feeling sluggish, I had a skin that I had done a lot of editing with and felt like things got wonky somehow.

Anyways I am having a playback issue, sometimes when playing a UHD bluray remux playback will stop and go back to the home screen, when this happens the skin will reload.

Before that happened I noticed I started getting a source too slow error. My files are on a windows machine that is connected to devices all over the house and none of them have problems. The network is gigabit. This only happens with 4k media. Anything I can try to do to solve this?