Installing system update - no command

[AC Question]

I have a galaxy note 4 running OS 6.0.1. The phone turns on fine and works fine (with the occasional battery issues as we all know). I read that it may help the battery if you wipe the cache every once in awhile and I had never done it since I got the phone awhile back, so I figured it would be a good time to do it. When I turned my phone off and held the appropriate buttons to boot in system recovery so I can wipe the cache, it showed the green android robot saying that it is installing a software update (which when I manually checked before it said there wasn't one)....then the robot fell on the ground and it said "No Command". It then proceeded to let me into system recovery mode. Why did it do that and is it important to fix it? Would this have some kind of effect on my phone performance or battery if it's a problem?

 

[Enseterat]

This is my post btw...I didn't notice that I wasn't signed into A.C.