API Error: API said to be invalid

Good day

I received communication from RoyalQ that my API is not valid. However, since that time, I have been able to do two transactions.

1. Is the issue still persistent? I ask this question because I managed to transact twice after I had previously faced challenges with the API in the morning. See the attached email from your office.

2. What will happen to my running trades if I change my API binding before they have closed?

3. What could have caused the failure of the API which has been working fine all along? Should I expect this break down often and what can be done to avoid it?

Sincerely