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Was cheaked all QBoards with 1 mean well for be sure that have same experimental condition and Cheaking connection. 2 work correct and 8 show problem.

10 pcs (QB288v2 r spec single combo) + 5 mean well HLG-240H-C2100B have been bought 1 year ago in August 2019. Dimirable. Everything was ok. Used only 2 grow cycle 3mosnth +3month. 2 work well and 8 have problem below. My problem is, when I reduce the power of the driver from 100 till...