I have been using the Dell UltraSharp U3219Q (32 ", 3840 x 2160 pixels) for a good year now. Because of my home office, it runs practically all the time from 0800 until late in the evening. (business, then private, I don't work 16h ;-)
More and more often I notice that after a good 10 hours of operation the display briefly goes black again and then fortunately comes back. This seems to be a thermal effect. Do others also have such experiences?
A monitor in this price range and from this manufacturer must be able to cope with this!
Otherwise, I am very satisfied with what the monitor offers.

Question

I have been using the Dell UltraSharp U3219Q (32 ", 3840 x 2160 pixels) for a good year now. Because of my home office, it runs practically all the time from 0800 until late in the evening. (business, then private, I don't work 16h ;-) 
More and more often I notice that after a good 10 hours of operation the display briefly goes black again and then fortunately comes back. This seems to be a thermal effect. Do others also have such experiences?
A monitor in this price range and from this manufacturer must be able to cope with this!
Otherwise, I am very satisfied with what the monitor offers.

Answer

If it had to do with heat build-up, it would always occur when the monitor reached a certain temperature. Not just after 10 hours. And it would be more frequent in summer than in winter. The problem is almost certainly caused by the graphics card, a slight defect...

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