Ask HN: Why do my online accounts keep getting banned?
Fidelity is the one to focus on immediately because it's the most serious-- by far-- and they have walk-in locations where a real account rep can help you. The downtown SF location near Market & 2nd has excellent staff in my experience.<p>Fidelity might turn up something about identity theft, or credit reports, or red flags, or similar. If so, you can handle these. If not, then ask a private investigator for help; a good PI has research tools to find problems then help you fix them.