Salesbox e-Signing is based on Salesbox's partner Verified's e-Signing engine and if you encounter any issues in the signing process you can follow the status of the e-Signing engine here: https://status.verified.eu

From this page you can also subscribe to status notifications to get notified in realtime whenever something happens that might affect the e-Signing process. 

You can also go here to choose what e-Signing updates to subscribe to: https://subscribe.sorryapp.com/c2ed623c/email/new