Azure网站有时无法连接到SQL Azure数据库

我已经在Azure中测试了一个网站大约一个月（免费试用），现在我订阅了“按需付费”服务。当我进行免费试用时，我完全没有连接问题。现在，我再次部署到一个按使用量付费订阅创建的新网站，该网站具有与上一个相同的设置（缩放模式等）。但是，现在当我导航到站点时，它有时无法连接到数据库：

Server Error in '/' Application.
A connection attempt failed because the connected party did not properly respond after
a period of time, or established connection failed because connected host has failed to
respond
Description: An unhandled exception occurred during the execution of the current web
request. Please review the stack trace for more information about the error and where
it originated in the code.

Exception Details: System.ComponentModel.Win32Exception: A connection attempt failed 
because the connected party did not properly respond after a period of time, or
established connection failed because connected host has failed to respond

Source Error:

An unhandled exception was generated during the execution of the current web request.
Information regarding the origin and location of the exception can be identified using
the exception stack trace below.

Stack Trace:


[Win32Exception (0x80004005): A connection attempt failed because the connected party 
did not properly respond after a period of time, or established connection failed 
because connected host has failed to respond]

[SqlException (0x80131904): A network-related or instance-specific error occurred 
while establishing a connection to SQL Server. The server was not found or was not 
accessible. Verify that the instance name is correct and that SQL Server is configured
to allow remote connections. (provider: TCP Provider, error: 0 - A connection attempt
failed because the connected party did not properly respond after a period of time, or
established connection failed because connected host has failed to respond.)

我尝试刷新页面并连接。几分钟后，当我再次尝试时，有时会再次遇到相同的错误，但有时却不会。在免费试用模式下，我从未遇到任何连接问题。为什么会发生这种情况？如何预防此问题？