I purchased a Wally and an external hard drive for use in an RV. I activated the drive and it works fine - when I have a satellite signal. Saturday we went camping and in anticipation of heavy rains, I'd recorded a few movies to the drive. Rains came and we decided to watch a move, but could not because without a satellite signal the DVR would give a message similar to "This feature is not available right now" (I can't remember the message, that's the gist of it). Is there a way around this?