1. Make sure that you are using privit CID and IDPS. I heard CCAPI gets alot of people banned. I have been modding for about a year now and had my original CID and PSID and account banned. I bought a private CID and IDP and have been using it for about 6 months without any ban knock on wook
2. I use multiman to load my game, PSNPatch to patch my new CID and PSID and use PSNinja to clean up my mess, the 1st 3 options before connection to SEN.
3. I never ever while connected to SEN use anything related to a JB ps such as homebrew apps etc.
I hope that helps because i know that feeling when you see that banned notice
G