My API requests only work if I limit my df to 1000 rows but not for full df consisting of 33000 rows

So I've created a dataframe which contains only postcodes and I'm using an api that outputs longitude/latitude json info when I feed it the postcodes df. I've created a function for this converter and used panda apply on it. I can only print my dataframe if I drop everything but the first 1000 rows.

#code only works if I trim it down to first 1000
#geo_data.drop(geo_data.index[1000:33227],inplace=True)

def postcode_converter(x):
    longitude,latitude= None,None
    new_url='https://api.getthedata.com/postcode/'+str(x)
    new_url=new_url.strip()
    r = requests.get(new_url)
    time.sleep(0.1) 
    r= r.text
    try:
        result= json.loads(r)
        longitude=result['data']['longitude']
        latitude=result['data']['latitude']
    except Exception:
        pass
    return (longitude,latitude)

geo_data['longitude'],geo_data['latitude']=zip(*geo_data['postcode'].apply(postcode_converter))
print(geo_data)