Endless problems with too many reminders being sent

Hi there

In spite of endless efforts to fix this, your plugin still sends around 30 reminder emails per client to each service provider when it should only sent 1. clients reminders and confirmations emails work fine.But this reminders function is causing us serious problems and after two weeks you haven't fixed it, even downgrading to 1.6 didn't help. we dongraded and it was fixed for a few days and then broke again...please help.