I have an Animas Vibe. I've only had it a few months but I've never had an occlusion alarm. With my previous pump, which I had 11 years, I only had an occlusion alarm once.
My DSN did the settings on my pump for me. I've just checked and my Occlusion Alert is set to H - high presumably. I remember the DSN choosing that and commenting about it 'going off all the time else'. Could you speak to,your DSN or doctor and check the occlusion sensitivity isn't the issue? I'm not saying that it is - I didn't have the faintest idea what to set mine to so left it to the DSN - but I thought I'd mention that mind appears to be set differently.
What sets do you use and does changing them stop the occlusion alarm?