Hi everybody,

We are experiencing random errors on some of our sites (all discrete sites running DNN 9.1.1). These sites suddenly start throwing errors to our clients' users and logging just a vague exception. This goes on for hours and then suddenly stops. 

When checking the event logs, we see these clusters of General Exceptions and Page Load Exceptions with no stack trace and only the following LogProperties text:

<LogProperties>

  <LogProperty>

    <PropertyName>AbsoluteURL</PropertyName>

    <PropertyValue>/API/InternalServices/NotificationsService/GetToasts</PropertyValue>

  </LogProperty>

  <LogProperty>

    <PropertyName>DefaultDataProvider</PropertyName>

    <PropertyValue>DotNetNuke.Data.SqlDataProvider, DotNetNuke</PropertyValue>

  </LogProperty>

  <LogProperty>

    <PropertyName>ExceptionGUID</PropertyName>

    <PropertyValue>0fccec5c-0f60-4c36-baac-eb24deafbcf8</PropertyValue>

  </LogProperty>

</LogProperties>

The AbsoluteURL Value changes randomly to Default.aspx, the GetToast API service or some other random page inside the site.

Due to the vagueness of the error I haven't been able to find what might be causing this, there is also a time component (this happens for some time and then stops, and it might not happen for several days, but then starts again). 

Is this a known error with this version of DNN? Might it be tied to hardware errors (like out of memory or IO errors)? 

Any help is appreciated. 

Manuel