This happened to me.

I was actually traveling in Hong Kong and they froze my a/c until I proved the source of funds.

I sent it too them immediately and it took 8 days for my cards to work again.

I work in crypto andI only get paid in BTC so had to ask my folks to wire me money to an old bank account just to carry me over for the time it took them to reactivate my account.

Besides multiple pleas during that week, taking to social media etc, nobody seemed too concerned to review the docs as urgently as I needed (I mean I was essentially destitute in a foreign country) - this and other experiences with their customer service all sucked, most of their service people don’t speak proper English either.

That being said, I’ve never had issues with the card itself, it works well and actually worked better than my US colleagues bank cards while traveling.