Cree 3 color LED

We have been using Cree 3 color LED's (CLV6A-FKB) in many products for several years (pic attached). At the rate of 3 to 5% of the units assembled with this LED, the Red LED fails. After touch up with soldering iron it functions. This happens to the Red LED only, and random on which of the several placed that fail. The solder connection appears to meet IPC-610 class 2 (same as the other 4 solder joints on same LED). Anyone seeing same results, we're kind of stumped. Producing 1000's of boards, the rework can add up. I have yet made an inquiry with Cree as those things can get involved.

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