A common problem for animals who frequently change nozzles is the heat block getting stripped.
They're all made of aluminum. The stock nozzle had red thread locker. The maximum torque before stripping probably isn't enough to get a reliable attachment. Replacing just the heat block is a huge pain, manely because all the bits which have to be removed can only be removed when they're hot, so the lion kingdom replaced the heat block, heat sink, heater, & thermocouple.