By default, the Magento application settings are such that when cron.php is being processed for a period longer than 15 minutes after a job was supposed to be completed, it is marked as missed and is ignored. This setting can be configured through the Magento administrative area -> System -> Configuration -> Advanced -> System -> Cron -> Missed If Not Run Within.
That is why it is recommended to change this setting to a value greater than 30 minutes - for example you can set it to 35 minutes. Otherwise, tasks that are only scheduled once a day or so may get marked as missed.
After that set Schedule Ahead for to 35 minutes and the cron jobs issue should be resolved.
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