Pedal body coming loose from cartridge

Hi team, it appears on my left Vector 3 the pedal body is becoming loose from the cartridge (not sure on terminology). The pedal does not spin freely at all - quite alot of resistance. If you gently clamp the metal and turn the pedal it seems to tighten up, but becomes loose again very quickly, and not game to clamp or tighten too hard.

Is there a fix for this? The Vector 3 service video from Garmin does not touch this part - I see it has 4 grooves for a tool to tighten it, can you do this yourself if you remove the spindle? Photo showing the issue. Right pedal the body and cartridge is flush and no resitance to spinning pedal (dual sided system).

Thanks in advance for the help!