I assume you try to wiggle your cabling and connectors to exclude the possibility of „external“ problem. Some of these 12v Power plugs are of trgic low quality. The ones supplied by ZWO I found very reliable though.
If this does not help, check connection AA directly to same power source you were using. If it still happens, it is the power supply or AA fault.
Hope it is quickly resolved. Fingers crossed.
Regards,
Stephan