weird one

just put my bike up on stands for a general check over and clean.

i noticed a subframe bolt missing. i grabed the back end and i could move the whole thing up and down. the 3 remaining bolts were loose......i have now tighteded them up and its solid again and i am seeing about getting a new bolt.

i have limited mechanical know how.......but surely the sub frame shudnt just come loose?? also would this cause my front end feeback wobble feeling?

cheers

Dan