Same here. I get 18 mins on my Phantom 3 standard and pro. On Solo I got less than 12 minutes launching and just hovering at 12 feet. If flying aggressively, less than 8 minutes. The Solo flight time definitely sucksI haven't experienced any battery issues at this point with the Solo. Most likely because I'm landed by 30%. I'm trying to take it easy on my three new batteries and I'm still in the testing phase with this bird.
However, I have not seen these things with either of my "white" birds. I've got eight batteries between those two birds and fortunately haven't had any battery issues "yet". I also don't see the more rapid depletion described here when the batteries get to the lower spectrum. Maybe a little but not very much. I will condition my statement with two things though, I always try to get my birds on the ground with about 30% and I rarely use the RTH function, I'm not sure I ever have except for testing purposes.
All that being said, I do think the battery time for the Solo is quite a bit lower than what I expected. I can get a good 18 minutes on my P3 and still land with 30%. I'm not sure I've been able to get 12 on the Solo. I'm not trying to start a Solo/Phantom ruckus, I'm just sharing my experience. I'm a proud Solo owner and supporter. Any comparisons that I provide are simply to help make the Solo a better machine.
Jerry