Happened to me 3 times. First time was early in the morning and I spent quite a bit of time looking for it. My partner was certain it landed in the middle of the fairway and the flight was straight, maybe a 2 yard draw. The other two times, I'm certain the ball was picked up by people playing on another fairway. This particular course has fairways adjacent to each other. It's pretty common for guys on the first tee to slice it into the 9th fairway and come pick up 'extra' balls while they're over there.
I am back. Not a lot of improvement, but I took a "live" lesson and also I sent videos to another instructor.
They both said that the first thing I should fix is coming over the top. In fact my standard trajectory is a pull slice as a result of it.
However, the first instructor suggested me that I should start the backswing moving the club to the outside, that would shallow the swing and make it easier to have a in-to-out downswing. The other instructor said I should keep it on the inside.
A thing they both agree is that I should put my ball back in the stance. When I do that, the reverse pivot (see last swing of the video) gets even worse and I hit fat shots.
In the images, you can see on the left my OTT swing, and on the right the "fix".
In the video, the first one is the OTT, the remaining are with me trying to have a in-to-out downswing
Any suggestion is welcome