I had an SD which would do that but it was not random...it appeared to be random but would do it when certain lights were powered on the cluster. I tracked it down to a burned trace on the circuit board in the cluster which was causing the problem. For example, I might have signaled for a left turn which would trigger the seat belt warning light to start flashing in its cycle.

Fixed the burned up trace and the light never came on again.

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Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz