DJI fixed mine! I used to experience loss of GPS from 7-8- to 3-5 when activating video. I tried aluminum foil, then copper foil. There was a slight improvement, but not good enough. I kept DJI informed on my modifications, they didn't approve, but were aware of the foil trick. I returned it to DJI a month after purchasing it, I had it back in 4 days! I assume this one is a newer unit with the ferrite things and larger GPS shielding that is mentioned online, it looks brand new, my crash evidence is not there. I won't be opening it to check. DJI emailed "We have replaced the GPS module, wireless repeater and video transmitter." Personally, i think they swapped it out for one of the 'new improved' models, which would not necessarily make their statement false. I should have noted the serial number. I am a happy guy. By the way, your credit card company can assist you with a defective product return for 60-90 days. I had a 'chargeback' in progress, but I tested the model that they sent me (in lieu of a refund) several times over several days, and it works as advertized. I cancelled the dispute tonight. Hope this helps. Be responsible, this is not a toy, as I quickly found out!! Don't hurt anyone or do anything to create bad press for the hobby. Get prop guards, they work fine, and it shows that you are responsible.