It can almost seem impossible to get the larger Q magnets apart, unless you have the right technique.
The larger Q magnets are needed to get the extra depth of penetration required to target the larger joints such as the hips and the lower back. But with size comes strength and being made from the strongest static magnet material available (neodymium) this can have unintended consequences.
It requires a shearing force to easily separate the magnets, don’t ever try pulling them directly apart or force a knife in between. The other key is to use your larger muscles.