Yes… but… it appears the freezer itself is a pretty big contributor, since simply switching it off lowers the leakage enough to stop the tripping. I think the point I am making is that the freezer itself might have been degrading for some time. You are now on the brink… which is why you can sometimes manage for the RCD to not trip.
It could be an issue with the RCD, but to be honest, that’s a bit of a hail Mary in most cases (an American football term). If it is that, it is cheap to fix, and the tester is cheap too, which is why I tend to test that first. But RCDs actually don’t fail all that often… I’ve only once had a case where it was actually the RCD (and after replacing it, I opened it up and found tool marks on the inside… a previous home owner had saved himself R300 by “repairing” and putting an old RCD back into the DB…).
What you need is an insulation test on the freezer. The tool used for that test is this:
Edit: In other words, find a sparky with an insulation tester. It’s likely going to cost you a call-out fee and one hour of labour. Depends on the worth of the contents inside the freezer. Alternatively, find freezing space from a neighbour… or shuffle around if you have more than one yourself. You could also hit up marketplace, there’s always someone swinging and old freezer (to tide you over). Finally, I tend to see these things as opportunities to buy that new A+++++++ rated appliance I’ve always wanted… if the budget allows