Telemetry "dropouts"

I’ve been experiencing telemetry failures at only 200-300 meters away. I plotted the rssi vs. noise (see attached), but the signal is much greater amplitude than the noise floor. Is this just a bad radio(s)? Or is there some other piece of data I should be looking at?

Radios are RFD900’s. Ground at 1W and air, connected to pixhawk, at ~1/3W.

thanks for any insight!

dataflash:
https://www.dropbox.com/s/hq7zz3bzci60qw1/2015-08-26%2015-43-48.zip?dl=0

Radios are running 1.12 f/w. MP is 1.3.29.