Recently I've been experimenting with different interconnects attached to my RPM4 but in doing this I think I've loosened the left-channel socket at the back of the turntable. The white plastic tube (insulation?) inside the socket visibly moves backward when I plus the cable in and also when the cable is in all the way you can easily move it back and forth a couple of millimetres, whereas the right one is solid. Playback is fine but I've noticed a strong hum and a light series of fast clicks coming from the right speaker which is still audible during the quiet passages of records. Bizarrely the hum seems to be affected by the type of interconnect I use. With an XLO PRO 125 it's quite loud, quieter with a 150 and seems to almost dissapper when I plug in a Chord Crimson. I assume it's something to do with the dimensions of the plugs and how they push things around inside the loose socket. Has anyone had this problem before?