Running the command for a few times produces no output after the 3rd or 4th command

root@kali:~/Desktop# echo hkt.com | gau --subs --threads 50 --verbose
INFO[0000] fetching hkt.com page=0 provider=wayback
INFO[0000] fetching hkt.com page=0 provider=otx
INFO[0000] fetching hkt.com page=0 provider=urlscan
INFO[0001] fetching hkt.com page=0 provider=commoncrawl
INFO[0011] fetching hkt.com page=1 provider=wayback