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TLC5973 - first driver in chain stops transmitting

During operation there are time where the first driver in a chain of drivers appears to latch and no further data is accepted. all lights in the chain are frozen in the last  received state.  the only way to correct the issue is to remove power to the first device.

Has anyone else seen this issue?   are there any undocumented commands that would possibly cause this condition?

Vito