It is possible to face problems such as Instagram couldn't refresh the feed and showing “no interment connection” you can resolve this with the help of some measures: 

• Restart your device.
• Try to update the Instagram application.
• See if Instagram doesn’t ban your account.
• Try to use Instagram with its official application don’t use an indirect way or third-party application 
• Verify the Insta server. Down in the Instagram server can cause this issue.
• Try to use a fast and stable internet connection.

These ways can help you with your feed refresh issue.