@Sadieme, do you mean that the shifter cables, where they pass through the cable hosing is coming away from the cable "stops"? The cable stops are the metal parts on the frame of the bike where the ends of the cables butt up against and slide into? I wonder what makes that happen? Maybe the bike shop can show you what to do when that happens so if you're out and it happens you won't be stuck somewhere in a high or low gear.