Weird Bug?

Hello! I'm just your fellow bronze player here. When I am playing the game at times my champion will just walk forward or where I click on the map. And not stop when i click another section for them to go. My ping doesn't rise so it isn't lag and also my FPS is also fine as well, but this has caused me to die a lot due to this bug. I'm trying my best to not get upset over it but when my team doesn't understand and starts reporting me and it effects my account then it's another story. I just came back into league after a year of being gone trying to get my life on track. Now that I have it on track I came back to enjoy my past self on here being my bronze support main self. If anyone else has had this issue and knows of a way to fix it let me know. And Riot if you read this please if this is a bug only you can fix please fix it soon. I am unable to record the moments as for I don't know how to. So please anyone get back to me ASAP?