Macbook Pro 2013 HDMI Monitor Goes Black for a few seconds

So I purchased a brand new Macbook Pro 2013 (specs below) and for the entire time I have been using it with a BenQ RL2455 via HDMI with no problems at all. Recently though I have started to experience problems between the computer and the monitor. There is no particular sequence as to when this will happen but the monitor screen just goes completely black for a couple of seconds, and then goes back to normal.
There is nothing to suggest that the monitor is being disconnected from the mac, as it still detects the fact that the two are still connected. I have followed each cable back to the source and they all seem to be properly connected.
As you can imagine, this is very annoying and inconvenient, and it would be much appreciated if anyone knows any solutions to this. I just thought i'd see if there was anything i could do before i contacted apple, just incase i was being a total idiot and missing something obvious!
Thanks!
Specs:
Macbook Pro Retina 2013
2.6GHz Intel Core i7
16GB Ram
1TB SSD

15" or 13"? How long have to had it?
I've noticed my HDMI monitor comes up blank on reboot sometimes. Using a late 2013 MBP Retina 13" for a couple of days now.

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Macbook Pro 2013 HDMI Monitor Goes Black for a few seconds

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