Tonight I had a lot of battery communication errors. It was getting pretty annoying. I didn't notice any drop off in performance & my phantom stayed aloft, so that's good - but the communication errors just kept coming up, accompanied by red LEDs on the tail lights. It didn't seem to matter which pack I used, but oddly, restarting the phantom seemed to cure it, until I swapped packs. Any ideas? I recently used contact cleaner on the prongs, could this have left a residue?