Hey Dennis!
Have you checked out the official UmbrelOS Troubleshooting Guide and FAQ? It includes a lot of helpful tips and steps that often resolve these kinds of issues.
Your node really shouldn’t be going into sleep mode or anything like that on its own.
Could you provide a bit more detail about the problem? For example, does the node completely shut down, just disconnect, or show any other signs? This will help us better understand what might be causing the issue and assist you more effectively.