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When that sort of stuff happens to me (and it does happen on occasion), I check all the connections for that channel. I'll rapidly twist the volume control. I'll rapidly twist my integrated's input selector. I'll lift the tubes up and down in their sockets. Nine times out of ten, one of these things'll cure the problem. More often than not it'll make the system sound better, as well. Sometimes connections just get grungy.
If you change cartridges enough this is bound to happen. Most good tonearms have very excellent wire that is capable of taking a lot of abuse.
It is always the junction at the clips that fails. Once one fails the others are usually not far behind. Get a good set of clips that come with colored heat shrink like these http://www.cardas.com/cartridge_clips.php
The heat shrink is critical as not only does it allow you to identify the wires but it serves as a strain relief moving the stress away from the solder joint. If you don't do this the wire will break at the solder joint every time from work hardening. The clip has to be held firmly. If you do not have a little vise get some modeler's clay and just push the clip into the clay with the solder end hanging out. If you do not immobilize the clip doing this will be a frustrating experience. Don't forget to push the heat shrink up the wire before you get started!
@edcyn I do those things sometimes except that pulling and reseating the tubes is not easy on my integrated. For that I'll have to pull it out of the rack and remove the top cover.
@noromance It was a logical bottom-up approach
@mijostyn Only on my second cart on this table so not too many clip pulls and it is a Rega arm so not the best clips out there.