that is some weird behavior. What i would recommend is getting your self up to the latest version of 7.1 (7.1.5) as there has been alot of fixes to it, and it is very stable.
In 7.1.5 we do not have any scheduler issues (that i know of)
you can download it here:
Just install over top of the version you have, and it will keep all of the settings.
let me know how things go!
Test Engineer / Beta Manager