Your may have lost some wheel weights used to balance the tire -it could be something in your tire like a nail or bolt - or the rim might be bent - did hit a curb/rock/mountain ?
It may have taken a while for the weights to fall off in some cases with radial tires the belts can shift - see if you can get someone to follow you down the road and watch - if you both have cell phones you can tell the other driver when it starts happening.
Something that feels a lot like an unbalanced tire is a slight flat spot from panic braking. No cure but to replace. Jack the wheels off the ground and watch for up/down variation while spinning it.
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