Epoxy crack causing intermittent failure

Silver epoxy is used to joint the LED beam lead and the trace of the flexi circuit. Due to the LED mounted skew upward or downward unconsistently, the strength of the joint weakened and causing the LED lights up intermittently. I would like to ask for help of how to screen out this intermittent failure. Any screening method or reliability test to screen out the intermittent failure? Thanks for ur help anyway. I need to solve this problem as soon as possible because the status is shipment hold for this issue. Hope that u can provide me some knowledge or opinion on this issue. Thanks alot

regards keith

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