Note 3 900a on cricket can't receive mms

I have an unlocked galaxy note 3 (at&t version) that I put on cricket 2 weeks ago. Everything works perfect with one exception. I cannot reliably receive mms messages. Voice and data are perfect. It will send and receive sms without fail. It will even send every mms I attempt send but for some reason it will not receive all mms coming in. As a matter of fact it misses most of them but occasionally one or two come through. The phone is unlocked. It is NOT rooted. I have not received a configuration message but I have entered the apn settings on their website and have checked them over and over but no luck. Any ideas? Thank you!