I had that issue with one ear of my 1964 Quads, but I'm using mine on a steady basis and I absolutely hated the idea of sending them for a refit and doing without them, even thought they suggested that I do so.
While talking with them, I asked if there might be something I could try in the meantime to keep the seal from breaking. They suggested trying the Comply Soft Wraps that are used for hearing aid fit adjustments. It's a long thin foam strip with really good adhesive that wraps around the canal part of the mold. I searched and found them on the, where else, the internet, but they may be available at a local hearing aid store. I paid $10 for a package of 20 of them. They saved the day! They have solved my fit problem, which could be my fault, anyway. The fit is great and the seal does not break at all. and it's not uncomfortable. One lasts about a month before it gets nasty and I need to change it.
I see no need at all to send the molds in for a refit, although I'm changing ear doctors when I get the next set of impressions made.