I have a mavic and so does my dad. We went out the other day and his controller drained significantly faster then mine. We both used the same amount of drone batteries (2) and we were both at 100% on the controller when we started. When it was over his controller was at warning levels meanwhile mine was at 80% battery left. The only difference is I was using a iPhone 7+ and he was using a note tablet. Is it a known issue that the controller will drain battery significantly faster using a tablet over a phone?