The job/session is canceled when the execution time exceeds more than 1 hour.
By default, Test Run will have 60 minutes of Test Timeout. If your execution time is more than 60 minutes, it will be canceled after reaching the timeout. Please follow this instruction to increase the timeout of your Test Run:
Go to testops.katalon.io > Select your Project > Test Execution > Test Run List > Select the desired Test Run > Edit
Click on Advanced settings > increase the Timeout in Minutes more than “60” then save it: