From what I understand about the object oriented Pro-106, you have programmed 1800 items (Systems, talkgroups, frequencies, etc) in your scanner with Aurora's system filling up the remainder of your active memory left. Banks do not apply for object oriented scanners, just the overall amount of stuff you have programmed in your scanner.
It's probably time to start expanding and taking advantages of the V-Scanner Folders to store away your unused systems and frequencies from other areas that you won't be using anytime soon (out of state, across the country, etc). I won't hitting that threshold anytime soon, so I can't really give you much input for V-Scanner stuff.
I hope I helped you in some way and wish you luck on your issue.