Download, run, and ATTACH (using the paperclip under the toolbar) the results of this utility:
No support for BRIX is offered here.
Nevertheless and in short form:
As far as I know, the i7-5500u is allowed to reach temperatures of 105°C for a short time. From your screenshot I can see a maximum temperature of 95 °C.
I wouldn't panic.
I don't know how loud a BRIX gets at these temperatures,
but the fan of a NUC would speed up dramatically and you are almost inclined to screw the NUC down so that it doesn't take off.