This cannot really be answered without analyzing your specific solution and logs of the issues. The try catch is really designed for specific sections in your automation rather than wrapping entire automations from start to end. In general, the exceptions contain a message that should let you know what the issue is. If you truly would like to disable exceptions from showing to the user, you can enable the SuppressErrors property of an automation and it will not display these.
If you'd like specific assistance with the exceptions that you are seeing, I would suggest opening an SR to get assistance from support. If you do open an SR, please update this post with the SR number.