API Server Said: "Unusual activity from ip"

Hello

I have build ionic 3 app, accessing api to remote server using shared hosting and cpanel,
I tried the app from real android device
but sometimes when the app send http request the api server said

“we have noticed some unusual activity from your ip … Please confirm that you are not a robot”

look like captcha appear from api server, so the json response failed,

but if i’m running on web browser or android emulator this problem not shown
any one have experience these issue, any solution for this??

thanks in advance

This is a server-issue, we can’t help your here.
Contact the people responsible for the server and ask them this question.