Siri reading previously read messages

Whenever I ask Siri to read messages that have just come in, she will read the previous 5 to 6 messages before that which I read before. Some of them are several days old. I've tried doing a reset and also have done a restore but the problem continues. I've also erased old messages but it starts again after a few come in. Anyone else encounter this issue? Reading the message to me was pretty handy when I'm stuck in traffic but because of this issue, I've stopped using this feature.