I recently bought a Philips 288p. There are known 'flickering' issues associated with the screen when it runs at 60 Hz - but this is not my problem. I'm not a gamer so I haven't found this an issue.
The problem I have is when I start up the PC, or wakes up, the screen flashes, cycling through a variety of options as it tries to get the best screen resolution (3840 x 2160). It takes two minutes roughly, then settles down and works fine. But it is extremely annoying to have to wait several times a day for this activity. I've gone to the Philips site and downloaded (and installed) the latest drivers, but to no avail. It all worked fine when I initially installed the screen, I was able to select the different resolutions through the options on screen (bottom right) Digital DVI. Now there is no choice. It is something I can live with as I like the additional screen real estate over the 22" it replaced.
Any suggestions and thanks in advance !