Ensure action executed

I have a robot in a virtual machine where users can send emails to, and the robot executes a range of tasks depending on what the user requests in the email.

Generally it works without issues (for days), but all of a sudden it starts failing. The problem could be mixed. For example, the password is not being typed or a click action is not executed (I have seen this happening when logged in the machine). I have the tasks set up in a try-catch so that they recover if there are errors, and I can see (as I get email notification) that the tasks some times will be tried a few times until it finally completes (where I get an email notification again).

How can I ensure that the UiPath actions are executed flawlessly or how can I check to see what is causing UiPath to fail on the system?