Here are some of the most common reasons why an item listing might "disappear" from your shop:
Your listing expired
Keep in mind that a listing stays active for four months. If your listing doesn't sell during that time, and it isn't set up to automatically renew, it expires.
To find your expired listing:
When you list a new item, it's set to automatically renew as the default. If you prefer, you can select Manual as your renewal setting when you create, edit, or renew a listing, or select multiple listings and choose Editing Options.
The renewal options as shown in the listing process
Your listing was deactivated
Double check your inactive items:
The item sold out
To see if your item sold:
Etsy may have removed the listing for violating site policy
Check your email inbox for a message from Etsy. Then, contact Etsy for help by clicking the link at the bottom of this page.