After purchase, occur NSURLErrorNetworkConnectionLost(1005)

I have question.

A few day ago, In korea, price changed dollar to won.

since that, i tried to purchase in-app product, occur NSURLErrorNetworkConnectionLost(1005).

but already It was paid to my credit card, so i asked Apple Service Center for refund.

Always It occuring error(1005).

1005:https://developer.apple.com/documentation/foundation/1508628-url_loading_system_error_codes/nsurlerrornetworkconnectionlost?language=objc

I tried to logout Apple's account and login again.

but, same that.

I guess that it relation to Apple's account.

How could I solve it?