Alumni are required to annually renew their UCI Gmail accounts; failure to do so will result in account suspension and eventually deletion. OIT will send you multiple reminders to do this, but if you aren't checking your account regularly you'll miss them.
Please note that when calling the Help Desk, sometimes the phone agent will not be able to see the reason why you are suspended and will need to open a ticket to escalate the issue. When this occurs, someone will be in touch by phone or email soon thereafter to explain the reason for the suspension.