Hi, I've browsed the forums at MacRumors on many occasions in the past and have signed up with the hope that somebody could offer advice - I just picked up a new Dell U3415W ultra wide display for my 2015 rMB(first edition - purchased Sept 2015) and have been experiencing a strange issue. The display is connected via HDMI using Apple's official USB-C HDMI adapter. Everything was going smooth during setup until I noticed the screen go black for a second and then come back on. Originally, I thought this was due to a loose cable but checked and found everything to be connected properly. This has continued to happen over the last few days. Every 30 minutes or so, the screen just goes black for a second and then comes back on. I know a few users on here have connected their rMB's to Dell ultrawides using the same adapters and was hoping that someone could offer advice/help. I really don't want to have to return the monitor because it really is fantastic but for the money it cost I don't think screen flickering should be something to tolerate. Thanks in advance!