Weird Behavior right after takeoff and right before landing

Could use some assistance with this log if possible. Looking at the log file it seems I had a current spike which caused a voltage drop in both instances. The copter started to fall out of the sky but then recovered. This was the second flight of the day with a new battery. First flight of nearly 20 minutes went without a hitch. Have had over a dozen flights without issue. Any ideas on what could have caused the current spikes and voltage drops? I do have retractable landing gear, but the retract/deploy didn’t seem to occur at the same time. I am running the latest release candidate rc8. Any help is appreciated. Luckily it recovered very quickly, but still a heart stopping couple of moments. I have video from the onboard camera if needed, but I don’t have external video. Thanks in advance.

Log can be found here: