Can somebody help me with with this issue?

Application under test : SAP 7.1
Tools Used : BPT, QTP, QC

Issue : During the execution of the automate test script, executed from Test Lab (QC) I encounted the follow issue :

Failed to update TSTest: Unspecified error

This error appears during the execution of component taking more than 2 minutes to excecute. I can bypass this issue by moving my mouse during the execution.

Expectation :

I would like to execute the test script during the nigh and obviouly I will not be ther to move my mouse. Do you have any solution for me ? What's the real issue ?

Thanks in advance