Multiple login failure alerts


#1

Team I am seeing in my router multiple login alerts like the ones that I am copying from the console on my router:
148 messages not shown)
jul/02/2018 12:00:02 system,error,critical login failure for user us-us-Hc3JHEEwmi from 172.31.62.153 via api
jul/02/2018 12:00:44 system,error,critical login failure for user us-us-Hc3JHEEwmi from 172.31.62.153 via api
jul/02/2018 12:01:43 system,error,critical login failure for user us-us-Hc3JHEEwmi from 172.31.62.153 via api
jul/02/2018 12:01:57 system,error,critical login failure for user us-us-Hc3JHEEwmi from 172.31.62.153 via api
jul/02/2018 12:02:42 system,error,critical login failure for user us-us-Hc3JHEEwmi from 172.31.62.153 via api
jul/02/2018 12:02:56 system,error,critical login failure for user us-us-Hc3JHEEwmi from 172.31.62.153 via api
jul/02/2018 12:03:41 system,error,critical login failure for user us-us-Hc3JHEEwmi from 172.31.62.153 via api
jul/02/2018 12:03:57 system,error,critical login failure for user us-us-Hc3JHEEwmi from 172.31.62.153 via api

(1) Why is this happening?
(2) How can be fixed?
(3) Are there problems with automation scripts here?

When I use the Mobile app everything seems working but I am annoyed with these alerts and I want them to stop. If not I will be obligated to remove this access completely.