mod_fcgid: can't apply process slot for

Hey
today suddenly our website has down, after checking log i found these lines:

[Tue Oct 29 14:08:33 2019] [warn] [client 164.215.224.210] mod_fcgid: can’t apply process slot for /home/xxx/cgi-bin/index_dl.fcgi
[Tue Oct 29 14:08:33 2019] [warn] [client 87.121.112.82] mod_fcgid: can’t apply process slot for /home/xxxx/cgi-bin/index_dl.fcgi
[Tue Oct 29 14:08:34 2019] [warn] [client 5.120.57.48] (104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server, referer: …

ive checking firewall, apache and also switch website from fcgi to cgi and dso but noting change,
file and folders perm are correct as i say we havent change anything from last month