Philips 499P9H/00
5120 x 1440 pixels, 49"
Philips 499P9H/00
5120 x 1440 pixels, 49"
The problem is not the monitor. It's more to do with the way the MacBook recognises the external monitor. I have the same problem with my work laptop and my work monitors. Have you checked the monitor sleep mode? For me, I turn the monitor off and on again and then wake up my laptop and it usually works fine.
Sorry for my poor German