after couple hour my masternode status get to missing

what could be wrong ? it start successful but after 1 hour or so it get missing
the port is correctly forwarded, and i see i have 2 masternode reward in progress
Restart your main wallet, sometimes it reports missing nodes when they are active. Don't restart your masternode until you know for sure it's inactive. You can use the
getinfo and
masternode status commands on your masternode wallet to help diagnose the problem.