Gas connectors need to be inspected regularly, and replaced as needed. Certain kinds of flexible connectors manufactured between 1970 and 1980 may fail over time and need to be replaced.
Only a qualified professional should check your connector and replace it if needed. Don't try to do this yourself, because a brittle connector could fail with minimal movement.
After disconnecting gas appliances, gas connectors should always be removed and the fuel line should be plugged and capped. It's a good idea to replace approved flexible connectors once every ten years.
Gas pipes should be properly maintained and never used for unintended uses such as hanging clothes