We'd like to apologize for some recent, intermittent problems when signing into Simplenote and syncing your data. The root cause is a problem at our hosting provider that is beyond our control. Thankfully, a large number of very smart people are working to solve that problem urgently.
An unintended side-effect is that, when one of these intermittent problems occurs, some of you are occasionally forced to sign out of your Simplenote accounts. This is a problem with the current version of Simplenote that we're working to fix. The only circumstance where you should ever be forced to sign out in this way is if you change your login information.
Please bear with us as we work through these problems, and we're sorry for the inconvenience in the meantime.
There's a known bug where syncing can become stuck. If this happens, please try closing Simplenote from the task manager and opening it again. We've fixed this in the next update, which is awaiting approval.