hmmm carlos you should’nt have worn the bearings out since jan, no chance! mine lasted 3 years with only a clean every so often and exactly the same type of riding terrain as you
i have had this before though mate, it ended up being just where the cranks hadnt been tightened up properly, id seriously take the cranks out completely, make sure you do them tight up and make sure the N/D side crank arm is pushed totally in, as sometime is that crank arm isnt totally flush it can create a play type feeling, ohhh and also the black preload plastic screw thing to, make sure its nipped up (but not to tight)
i would be seriously seriously surprised if its the bearings on a hope BB