I recently bought a Sony LX250H turntable, new in the box at a retail store. I took it home and used it, after about 10 songs the sound audibly slowed and from then on my vinyl sounded bad. I returned it and exchanged for another new one in the box. Brought it home and set it up and after 23 songs the same "slow down" effect happened again.I don't get it. I had my old Sanyo goin' for 20 odd years with no probs. Has anyone else had this problem? What's the fix? The store only had two boxes so I figure I'll end up with the first one again if I exchange it....now what?