Testcomplete Tests hangs when running for days through batch file on remote machines
On your batch file you must wait a little before killing process and launching new instance of TE. Process lifecyle treatment is not instant. So use some pause 3 to pause 3 seconds between each call.
It could be the problem..
About windows event log, on your panel on left side you have Windows logs entry with sub category, open the Application category and look at time where the problem occured if any special message appears.
Same for Security category and System category.