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What if there's no wind to shut the entrance gate!?! I think the repairman is making excuses - and not very good ones.
The gate should not make a huge bang to lock. You should file a grievanc/complaint with the HOA board and see if this cannot be repaired. Make sure you inform them that the gate is interferring with your quiet enjoyment of your property, causing the HOA to be in default of its contract.
If you can get other residents to join you, it would make even a stronger case to the HOA board. The board should take steps to resolve this.