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Hi,
That sounds strange. When you add a new contact, do you store it as a Phone contact or Google Contact e.g? The contacts that you have now in your phone (that doesn't disappear), are they imported from the SD-card/synced from Google etc?
Do you have filters enabled - open Contacts then tap the 3 dots then Filter then check those settings
Could you try the following:
1. Go to Settings > Accounts > Google > Tap at your@google-account > Unmark "Sync Concats".
2. Go to Contacts > Menu button > Export contacts > Choose Internal or SD-card > Confrim export.
3. Go to Settings > Apps > Swipe to the tab "All" > Contacts > Clear data. Do the same for Contacts Stroge which also can be found at the tab "All".
You can now go back to Settings > Accounts > Google > Tap at your@google-account > And mark "Sync contacts" and the contacts from your Google account will be synced again. Add a new contact and check if this one still disappears.