I own a Padrino Breve, and it's a great pen with a smooth nib. HOWEVER, it has an annoying habit of taking forever to start up when left (capped, no less) alone for more than 10 minutes. On top of that, the ink flow is inconsistant

I've tried flushing it multiple times. I really think that the issue lies in the nib. Can anyone help me? It's a steel nib. Thanks!