This evening I attempted my first nighttime flight. I calibrated as always before take off and when I first took off I let the P3 Hover for about five minutes. I have noticed since the last firmware update that contains the new auto flight features 1.4 that sometimes the altitude and descent float. What I mean is that instead of hovering in one stationary position it sometimes is a bit fluid and floats up-and-down in GPS mode. It usually settles down. I climbed to about 200 feet and was shooting video and when I pulled back on the left stick to decrease altitude instead of coming down the aircraft moved forward and did come slightly down but the forward motion was much greater than the amount of the descent. Being my first nighttime flight it made me nervous so I decided to land. I was unable to come straight down. I had to come down a few feet and stop and correct for forward drift. Come down a bit more and again stop and correct for forward drift. I had to repeat this crazy process all the way down. I was finally able to successfully land the P3 but I am very curious as to why pulling back on the left stick did not cause the P3 to come straight down?