I was out last week and after a rocky descent i noticed the tyre was rubbing on the frame, on closer inspection all the spokes had come loose to the extent that the wheel had lost all tension and i had to walk home. So i tightened them all up again but last night the same thing happened, not as bad as i was checking them regularly and i'd remembered my spoke key but they seemed to undo themsleves.
The thing thats most puzzling is that it isn't a new build, i did it a few months ago and it's had plenty of previous outings so why should it start doing it now?
It's an 819 on a hope xc hub with the correct length spokes, i've checked the hub, rim and eyelets for damage but there doesn't seem to be any.
Any advice before i rebuild the whole thing with new spokes and nipples??