Resistance of an EQ knob

The resistance of one of my EQ knob (mid EQ channel 2) has lost its resistance when the others are fine. Is there a way that I can fix this without sending back the unit?

If it’s working , like it’s adjusting the sound of the audio, I wouldn’t worry about it. If the audio is affected then there’s nothing anyone can do from the outside so it’ll need to go into a service center

Take off the knob cap and check if there is a nut You can reach and tighten that up. On many mixers this will increase the pot friction.