Well, here's an update! My 520E is back from Vertigo Drones and it flights well but now I have serious video lag and drop outs at close range. This problem usual happens only when you push the unit out a good distance but now I'm seeing it much less then a 100ft. Everyone knows if you are flying in close proximity with this lag and using video feed your at risk of crashing your aircraft so now up close inspections are now out of the picture. I have sent Vertigo a few emails but no replies to my requests about the repairs done to my drone and now video feed issues. I have looked at their reviews and noticed I'm not the only one not receiving correspondence. Hopefully they respond sooner then later so I can use put my done back in use so I will let you know what happens next so cross your figures.