How do I restart my vault?

Hello there, I was wondering if you could guide me through the process of restarting my vault. I've been having some issues with it lately and I'm not sure what the correct steps are to get it back up and running smoothly. Could you please explain the process in simple terms, and also let me know if there are any precautions I should take to ensure the safety of my assets? I'd greatly appreciate your help with this. Thank you in advance!