When a test is running on accelQ, there is a maximum timeout for which an element or page is waited on. Your test logic may be trying to interact with an element, but it is taking time to load on the page. You can configure for how long the test execution will wait for the element to show up.
There are two configuration items you can setup when you kickoff a test. One for the element timeout and the other for page loading timeout. The latter is used during Context synchronization.
When you are running a test, in the Run modal, click on the "PAGE / ELEMENT LOAD TIME" section. Update the timeout values as appropriate (in seconds).