Me and my friend have been experiencing this a lot recently. Running from Kamyshovo to Electro, reaching Electro only to bounce back to Kamy. And what makes it worse, all the energy you use to run doesn't return. The only way we found to avoid this is to jump on to a low populated server to do the running. We have never had it happen on a low pop. EDIT: Oh and to add, we were always sprinting with fists up. Ill try it with fists down tonight and see if the same thing happens!