Trouble With HDMI & External Monitor

Hi,

I bought an LG external monitor and it's giving me some very annoying trouble when I'm using it with my Macbook Pro.

I have a Moshi MD port 2 HDMI adapter and an Apple HDMI cable.

The thing is when I connect everything, it works OK for some time and then I start getting this "rain" randomly.

I uploaded a video on youtube so you can see it better.

http://www.youtube.com/watch?v=3-WO9rY8_dU

Any help will be appreciated! Thanks on beforehand!

 

I have an LG 23" IPS234.

I don't want to think that this is an LG issue, I've found information on other sites about this issue with other brands, the thing is I formatted the MBP and I can't find them again