Check disk space on your HDD hosting your B2D folders and make sure it isn't running out of space...I'd also check your B2D settings to make sure it's allowed enough space to back up too. If you set your threshold too low (the threshold at which BEWS stops receiving information for backups effectively queuing your jobs), it could also cause issues. Set it at 95% and try again.
Lastly, just check and make sure your retention settings are correct for your jobs. Retaining information for too long means that could be a cause for backups not running!
Laters!