This issue has been in discussion (actively) since last August here:
After months and months of new reports, it's pretty clear that this is an Apple Mountain Lion problem and one that Apple needs to address. As one frustrated user noted :
>>There is no consistent solution for a user. Apple has to supply it. All you can do is submit a bug report to
Please, if you are encountering this problem you will save yourself a lot of wasted time and energy simply by joining me and others in asking Apple to fix this problem: Make a bug report.