Why do floats fail?

A flow that has been running for months rarely stops at random. The causes tend to be the same.

The connection has expired

By far the most common. The flow runs using a login that needs to be renewed, or under the account of someone who has left. Use a shared account for everything in production, and make sure someone is notified when the connection needs to be renewed.

The data looks different than expected

The flow is built on the assumption that a field is always populated, and then one day it is empty. Or a text is longer than the field it is supposed to go into. Add checks for the fields the flow actually depends on instead of making assumptions.

Something changed elsewhere

A field was renamed, a folder was moved, or access was restricted. The flow was not taken into consideration because no one knew it existed. This is a good reason to maintain an overview of what is running.

Make errors visible

Set up error notifications to be sent to a shared mailbox. Otherwise, the problem will only be discovered when someone asks why they have not received their notification for three weeks.