I just purchased a new replacement spark combo because my first one seemed to have some responsive issues responding to the controller. I didn't want to take any risks with it malfunctioning again, so I decided to get a replacement. I still have the old one and plan on bringing it back next week. I've noticed though that on my new one the startup jingle sound when you turn it on is not the same volume as my first one. It sounds a bit lower in volume and slightly muffled. Most people probably wouldn't notice, but having both to compare to, I notice the difference. Also the camera on this new one doesn't seem to be as sharp as on the other one. All settings are the same under photo/video and I using the latest DJI GO 4 on my S9+. I am referring to footage from the SD card not cache.