Bearings Problem?

I bout 93 F150 XL 2 months ago, seems to be in good shape, but the rotors were warped and so i had a new brake system put on(front), i also noticed that a metal to metal sound and indeed the bearings were out, so they were fixed with the brakes. Had that done about 2 weeks ago, everything was great but i now notice that sound returning, picking up with speed and decellerating with speed. My question is could the bearings already be bad... the sound is only present when the wheels arent turned... or is it maybe tires... doubtful because i feel a resistance when letting off the accelerator. Anyway if anyone has a clue please help!

Did they replace or just repack the bearings? New bearings would not have gone out that quick.

I guess they woulda just repacked them b/c i took it back up their today and they siad that the bearings coulda been bad in the first place, so they put new ones on