What Koenaw said would probably be helpful about relaxing joints. Relaxing joints usually takes off some of the pressure and makes it harder for the joints to DM. So if you see one of your joints under a lot of pressure and stress or a strike that can potential DM you such as a snap kick, try relaxing the joints that will take the most force and that will lower the chance of those joints DMing. Kind of hard to say, maybe post replays of some of these DMs so we can see where the problem lies?