I see unusual errors in the logs.
To ensure that you are getting the most up-to-date information on your maintenance windows, ensure that you are able to receive Acquia maintenance notices.
During normal Acquia maintenance windows, Acquia Cloud websites may experience occasional errors such as:
Internal Server Error The server encountered an internal error or misconfiguration and was unable to complete your request.
You may also see errors in your error log like this:
[Fri Sep 05 11:20:22 2014] [error] [client 10.100.10.201] Premature end of script headers: site-view.php[Fri Sep 05 11:31:56 2014] [warn] (104)Connection reset by peer: mod_fcgid: read data from fastcgi server error.[Fri Sep 05 11:31:56 2014] [error] [client 10.100.10.201] Premature end of script headers: index.php
If you are receiving these types of errors, stop any changes that you are making to your website and ensure that you are not in a maintenance window. If the errors continue, you may need to open a ticket with Acquia support.
If you are not sure if your errors are related to a maintenance window, you can start troubleshooting with the article Introduction to troubleshooting with log files.