OMFG SAME!!!!!!!!!!!!!!!!!! I remedied the problem by turning my pc on its side (SRS) Now instead of 2-4 times per hour happening it happens 1-2 times a day.
I've yet to figure out the problem despite making over 20 different posts. Youll be told its the monitor, cables, drivers or gpu/mobo/psu.
For me I'lll just be playing games or surfing the web and boom out of no where "no signal to hdmi" my gpu fans spin up the mouse and keyboard turn off and the only way to get it back to normal is to "hard reset" which is holding the power button until the pc turns off.
My specs
Ryzen 1500x
RX 480 4gb nitro
2x4gb 2133mhz
1tb WB
B350m GAMING PRO micro atx
Corsair vs 550w