I have a i5, 256, SP4. It is connected to a surface hub and 2 HP monitors. The setup has worked fine for a few months. I have had a problem where my SP4 fan was pulsing on/off a couple times a second until I would restart intermittently so I exchanged it before extended warranty ended next month. They took my mint condition SP4 at Microsoft store and gave me a refurbished one at my disgust. I brought it home and it did its updates and now my external monitors are going black every 60 seconds or so for 5 seconds. Sometimes I get longer durations before the issue repeats. I ran the surface repair tool, I updated my surface dock, I changed screen refresh rate, I made sure all updates were done etc. nothing physically changed on my setup other than the SP4 itself.
Any ideas? I still have a month of warranty left and am wondering what I should do?