I am using a USB bluetooth key on my ultrabook to allow me to use my own keyboard and mouse. As the temperature is rising, heath wave for five days, I see that the connectivity of the mouse to respond is not as good. So, basically, I have to get the ultrabook closer to the mouse during the day. At night, as the temperate is lowering, I can put it back to its normal location and everything works ok.

As those devices have their own CPU built-in, they seem to be somewhat affected by that. They do not have any fan so that might explain.