Account frozen 4 times in 2 weeks

My account has been frozen 4 times over the last 2 weeks, each time without warning, due to Fica issues, but no one can tell me what it is that is causing the problem.

My banker has been very good by activating the account every time without much delay, but it has caused havoc for me in terms of paying my bills.

I have submitted the requested documents every time, yet this is still happening.

Am seriously considering changing banks after what seems like a lifetime of being a Nedbank customer.