Unable to Connect to Google Play

I've not been able to connect to Google Play for about a week - I've tried all the different suggestions online from EA and Google separately. I get the "Connection Lost" error: "Your session has expired. Either another device has logged into this account, or it has been 24 hours since you last logged in." I'm at my wits end with this ... I have an Android/OPPO Reno 5 lite. Any help would be appreciated.