Sometimes I have a similar issue. This past weekend, my kicking out of my hands was awful compared to my usual standard, I lumped the ball straight down the middle for their centre halves to gobble up. This happened three times in the first half but didn't happen at all in the second.
With age, I've been able to reflect and learn and minimise the amount of times that it happens as its pretty much a mental thing for me. When I think negatively or try to overthink any action then I tend to mess it up.
Take two deep breaths before any kick, slow down your action and relax the whole process. with time and practice it will become second nature and you'll be able to perform the kick without thinking.