Big problem with 'asp.net>odbc>mysql' website

I have asp.net web site that connects on mysql 4.1 databse via ODBC.
From
time to time it happen that connection is just being lost by itself,
visitor got error message. Then I just log into my control panel and
retype SAME password and after that it works fine for a while.
Strange, isn't it ? Can anybody tell why is this happening ???

Thanks;

P.S. Here is exact error message:

Server Error in '/' Application.
--------------------------------------------------------------------------------

ERROR [HYT00] [MySQL][ODBC 3.51 Driver]Access denied for user
'usr446'@'WIN3' (using password: YES)
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.Data.Odbc.OdbcException: ERROR [HYT00]
[MySQL][ODBC 3.51 Driver]Access denied for user 'usr446'@'WIN3' (using
password: YES)

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:


[OdbcException: ERROR [HYT00] [MySQL][ODBC 3.51 Driver]Access denied
for user 'usr446'@'WIN3' (using password: YES)]
System.Data.Odbc.OdbcConnection.Open() +637
ch._default.Page_Load(Object sender, EventArgs e) in C:\Documents
and Settings\Wolf\My Documents\sitef\default.aspx.cs:95
System.Web.UI.Control.OnLoad(EventArgs e) +67
System.Web.UI.Control.LoadRecursive() +35
System.Web.UI.Page.ProcessRequestMain() +750




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Version Information: Microsoft .NET Framework Version:1.1.4322.2300;
ASP.NET Version:1.1.4322.2300