Just recently had my Hoover Windtunnel Self-propelled Anniversary serviced and cleaned but it seems the guy didn't tighten the head enough it works fine with brushroll shutoff but when i go to move from room to room the brush starts spinning it stops if i push the head up so i think something is just a tad loose, i don't want to go back to the shop if i can do it myself because I'm already having them do a warranty on another vacuum and I don't want to bother them with something i honestly could ignore if i have to do so plus I'd like to lern how to do my own repairs so I'm not paying shops for simple fixes, lastly i don't feel this machine is old enough to have a bad hoover lean where it would do this and didn't do it before i took it in, again any help appreciated