To those who know rear wheel maintenance... My rear rim, which I bought 4 years ago new and completely built (by the rim manufacturer), once again has a loose hub that will need to be tightened. Why do I have this problem too often, no matter what bike I own?? I do my own maintenance at bike co-ops and on a regular basis. Because I live on my bike, I overhaul my hubs every 2 years, replacing the freewheel every 1.5-2 yrs. The current rim I repaired in April '24 at a co-op and it was checked and approved by the mechanic/owner who was assisting me (who bragged how he had almost 30 yrs experience repairing bikes). Less than 2 months later, the wheel was wobbling again and I had to take it into a shop to get tightened (I wasn't near a co-op). When I tested the wheel for movement yesterday, I could feel it slightly loose again! WTF?!? This is not the only rim/bike I've had where the wheel has gone loose on me. While I do swear that my bike is possessed (and loves to give me repetitive problems with the same maintenance issue until it finds smthg better to harass me with), previous bikes have given me the same problem (tho not repetitively). WHY? I carry approximately 30lbs of weight on the rear rack, so I don't believe it can be from overloading.

Any knowledgeable insight to this is welcome. Thank you.