In case anyone else runs into this on a Hyper-V 2012 R2 setup:
I have a 2012 R2 Hyper-V Cluster and the only server I had dropping network connection constantly (usually ever 20 hours or so) was AirWave 8.0.5 (initially).
I tried installing Linux Integration Services Version 3.5 tools for Hyper-V (I had to remove 3.4 for it to install clean). I upgraded to 8.0.7. I rolled back any of the nfs mounts I had been using for backups - but I kept losing network.
Then I actually removed the 'legacy' adapter and gave it a standard network adapter. I had to edit ifup files for eth2 instead of eth0, but then the network stayed up. The only piece that didn't work was authentication through Clearpass. I needed TAC for that; essentially the AMP database needed eth0 updated as well.
Airwave has been up for weeks now and oddly enough the fix for me was to get off the legacy adapter.