hi all, started getting a vibration from the front end the other day. got really bad for a couple of minutes with the wheel juddering quite badly then just stopped. has done it a couple of times since but again disappears. it feel almost like a warped disk but does it whether im using the brakes or not and when it goes away does not feel like the disks are warped under braking. anyone got any ideas? could it be a wheel bearing? though if it was would it not do it all the time? have checked the obvious i.e play in wheel and wheel nuts being tight ect but everything seem normal.

thanks in advance

Ross