I am very sorry that this happened to you! Losing work that you have spent time working on can be very frustrating. I assure you that I will try my best to find the cause of this issue.
In order to do this I would need you to provide answers to the following questions:
What web browser (e.g., Internet Explorer, Safari, Chrome, etc.) and operating system are you using? Do you connect to the Internet through a work network or router? Who is your Internet Service Provider (ISP)?
What changes were you making within the campaign when this occurred?
Once I have these answer I can definitely suggest some steps to take next. Also please take a look at the troubleshooting steps listed here if the issue is happening constantly when you are using Constant Contact.
Lenszie V. Community and Social Media Support
If you find my post helpful, and it answers your question, please mark it as an Accepted Solution
You can post a new message in the Community or find us on Twitter Mon-Fri 8am-8pm ET, Sat 10am-8pm ET, & Sun 10am-6pm ET. We've got real people waiting to help you out. Click below to start a conversation!