MacBook Pro 15" losing HDMI signal intermittently

MacBook Pro 15" Late 2011 (Mavericks 10.9.4); 4 GB ram.  I am running HDMI to a new video projector.  The HDMI signal is lost periodically for about 1-2 seconds and then comes back.  It occurs about every 5-7 minutes (about 20 times during a 50 minute lecture).  It loses both video and audio. Screen goes black but no displayed messages.  I have read a variety of other posts with similar symptoms with various computers (e.g. Mac mini) and even with DVI cable use.  In my case, I've used two different HDMI adaptors so it's not the adaptor. I'm pretty sure it's not the HDMI cable itself.  (A fellow professor does not have the issue with his PC and he uses the same equipment.) Neither the computer nor the cable is touched.  (I have another colleague who reports the same symptoms in his music lab.) Bottom line is that it's a distraction to my students and it's occurring off different Macs in different locations.  This means to me that it may be something with the particular generation of Macs we're using.  Looking for help to resolve the issue.

Assuming this is your machine - MacBook Pro (15-inch, Late 2011) - Technical Specifications you are using a DisplayPort (from the Thunderbolt/DP port) to an HDMI adapter. Non-Apple adapters have issues.
The other factor is that there are GPU issues with the AMD - problems with amd gpu on early 2011 macbook pro (there are many threads like this).
Either issue may be impacting your Mac connectivity.  The third-party adapters may not be able to drive signals consistently.
Can you test with an Apple-branded DP-to-HDMI adapter and the 50' cable?

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