My jade transplant of about 4 years, which has been repotted 2 times over the years, suddenly had brown spots on some of the paddles, including the large ones (under the dust that collected). We pruned the ones with the spots and it almost immediately looked better and started to sprout new leaves.

Keeping a diligent eye on it, we have noticed some brown spotting is back after about 3-4 weeks.

The plant is inside, gets good sunlight (not direct enough to burn) and is watered about 2x per month less than a cup each watering. Any ideas? Should we repot again or change soil? Prune? Less water?