This would normally indicate an error with the php script itself. Please check your error logs as they will tend to shine some light on the issue or enable display_errors in Select PHP Version > Options
You can log into your account panel at https://x10hosting.com/panel and it will inform you on why it is suspended. If suspended for inactivity, you can unsuspend it yourself by clicking the unsuspend button. For all other suspension reasons...
If you did not reach the 3 domain limit, you can add a new one, make it the default domain, and then delete the old one. After the old one is deleted, readd it, reset it as default, and delete the temporarily added one.