I've been having some serious problems with my FH7's. The MMCX on the left earpiece has consistently been cutting out. I tried all the tricks, changing cables, using the fork trick to pinch the cable end, etc, etc. Still no good. Ultimately the connection of the inner wire was not being made properly.
I had all but shelved my beloved FH7's and today I was thinking about the problem. If I could reduce the distance between the earpiece and the wire, I could perhaps effectively improve the wire contact, i thought to myself.
With this in mind, and ready to bin my FH7's I thought what have I got to lose, so I took out my angle grinder and ground about half a millimetre off the aluminium face of the earpiece, where it connects to the wire. I clicked the MMCX connector back on and noted the fit was much looser, BUT i was getting a good sound. I got some super glue and glued the MMCX cable end to the earpiece and allowed to dry. Now it's working like a charm. No cutouts, I have my FH7's back, hard wired, but working perfectly. Woohoo.
Sometimes dire situations need drastic measures!