In my opinion this bug is random and it’s present from 1 year.
There is not any solution to solve because Katalon and selenium have the same bug and selenium is the base of Ui vision.
For securety reason i run a macro, after i close firefox and reopen before run another macro to limit the “Error #101: Kantu is not connected to a browser tab” bug because it is random and it ìs present in all version of Ui vision.
I seach a solution from 1 year a this bug and there are nothing to do.