That’s a network issue - sometimes your network will lose the connection to the server and reconnect. During the period that you’re disconnected, your rider will continue at 25% power, and then you get put back in where your 25% guy is when your computer re-establishes the connection. It’s fairly rare, but it does affect some users unfortunately. It’s the same concept as “lag” if you play other types of online games. My personal internet connection is actually pretty awful, and I’ve found it’s mostly a weak wifi signal in my case.
I’ve got a server update ready to move that to 75% power (25% is too harsh), but I need to wait for a quiet moment on the game servers before I can reboot them with the update.