I tried to get at least some sort of replication, but I can't figure it out.

When I roam around, I often zig zag out of habit. That is I strafe additional and take turns etc.

In this build, there are like two to five instances per hour in which the avatar continues on the trajectory I gave him, but wont stop.
I have to release the keys (wsad) and then press W again to stop. Often the continuing movement is occuring when I strafe to the side.