Are you using the stock trigger assembly? I once had a case where the reinforced plastic of the assembly fit very tightly inside the gearbox and required sanding for the trigger carriage to disengage properly. In the same gun the top of the trigger carriage would also get stuck on the reinforced tappet plate when the cutoff lever tried to disengage the trigger.
In my case I fixed it by sanding the sides and top of the trigger carriage to move freely and clear the tappet plate, and I widened the space between the connectors inside the trigger assembly.
Fairly unlikely that you are experiencing this problem but hey maybe this will help.
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