This is typically caused by a brown-out condition on the decoder where the supply voltage drops below the minimum but not all the way to ground. This condition can corrupt internal registers and cause unpredictable operation. This is often seen as a slow drop on VCC when the system is turned off (possibly because of large capacitors that have a very slow discharge) or the transient drop on VCC due to something in the system. This can be resolved by ensuring the voltage gets to ground within 100ms.
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