Slow automations down to avoid silent overload
Automations can move faster than the tools they connect to can handle, and that speed can cause quiet failures that look like something else entirely. Adding a small delay or a limit on how much runs at once can prevent trouble before it starts.
This matters because when an automation sends requests too quickly, the tool on the other end sometimes just drops some of them without any clear error message, which looks exactly like a random, unexplainable failure. People chase the wrong cause for a while before realizing the real problem was simply speed. A deliberate pace, even a small one, gives every step room to actually complete before the next one fires. I've chased the wrong cause more than once before realizing the real problem was simply speed, not anything actually broken.
Check whether the tools your automation connects to mention any limit on how much they can handle at once, and build around that limit on purpose.
Try this today: add a small pause between steps in your fastest automation and see whether that quiet, unexplained trouble disappears.