Still facing problems with clicks

I have a table in an update panel and i each column can be sorted by clicking on an href in the column header (asc and desc)

I use recorded clicks on the header of 7 columns and then check by code the  right order of the content

very often, but not always, the click event hangs (also ajaxtimeout is set to 1500 or higher

the logged error is 

'25.04.2013 11:21:24' - 'Fail' : 13. 2_23_Click 'ProductOverviewProductGridDerivativeWKNToggleLink_DESC'
------------------------------------------------------------
Failure Information: 
~~~~~~~~~~~~~~~
Wait for condition has timed out
InnerException:
System.TimeoutException: Wait for condition has timed out
   at ArtOfTest.Common.WaitSync.CheckResult(WaitSync wait, String extraExceptionInfo, Object target)
   at ArtOfTest.Common.WaitSync.For[T](Predicate`1 predicate, T target, Boolean invertCondition, Int32 timeout, WaitResultType errorResultType)
   at ArtOfTest.Common.WaitSync.For[T](Predicate`1 predicate, T target, Boolean invertCondition, Int32 timeout)
   at ArtOfTest.WebAii.Core.Browser.WaitUntilReady()
   at ArtOfTest.WebAii.Core.Browser.ExecuteCommand(BrowserCommand request, Boolean performDomRefresh, Boolean waitUntilReady)
   at ArtOfTest.WebAii.Core.Browser.ExecuteCommand(BrowserCommand request)
   at ArtOfTest.WebAii.Core.Actions.Click(Element targetElement)
   at ArtOfTest.WebAii.Controls.HtmlControls.HtmlControl.Click()
   at ArtOfTest.WebAii.Controls.HtmlControls.HtmlControl.Click(Boolean isClosing)
   at ArtOfTest.WebAii.Design.IntrinsicTranslators.Descriptors.ClickActionDescriptor.Execute(Browser browser)
   at ArtOfTest.WebAii.Design.Extensibility.HtmlActionDescriptor.Execute(IAutomationHost autoHost)
   at ArtOfTest.WebAii.Design.Execution.ExecutionEngine.ExecuteStep(Int32 order)