Why does the external monitor on my MBPR constantly lose its signal?
I was able to resolve this issue by using this $10 adapter: http://www.amazon.com/gp/product/B000A8DSY2/ref=wms_ohs_product?ie=UTF8&amp;psc=1

For whatever reason, the MBPR likes the monster adapter much better than the Dynex DVI to HDMI cable I purchased from Best Buy. Now I use a DVI to DVI Dynex cable connected to a Monster adapter and it is much more reliable.