Airport arrivals data - no longer available

Hi,
I've been working on a fun project where I try to get sms texts when my friends are flying near me or my wife is arriving. I used the airport arrival query:
opensky-network.org/api/flights/arrival?...25268&end=1570198068

But now its giving me no information.
Is this a known problem?

Can you provide information on the current-ness of the departures data ? can I query departures for an ICAO in the previous 1 hour window from now and get back a list of departures in the future for that airport ?? I have been trying your departures API and it seems hit and miss as to whether it returns any information - it will give me information for August 1 2019 to August 3rd 2019 , but nothing in the past 2 weeks .... is there an issue with your API At the moment ? I understand that you have to wait 10 secs between requests.