This what I see when I connect through serial console:
Apr 26 15:04:38 cloud-hosting systemd: cwp-phpfpm.service: main process exited, code=exited, status=78/n/a
Apr 26 15:04:38 cloud-hosting php-fpm: [26-Apr-2020 15:04:38] ERROR: FPM initialization failed
Apr 26 15:04:38 cloud-hosting systemd: Unit cwp-phpfpm.service entered failed state.
Apr 26 15:04:38 cloud-hosting systemd: cwp-phpfpm.service failed.
Apr 26 15:04:41 cloud-hosting crond: postdrop: warning: mail_queue_enter: create file maildrop/879396.2445: No space left on device
Apr 26 15:04:41 cloud-hosting crond: postdrop: warning: mail_queue_enter: create file maildrop/908680.2872: No space left on device
Apr 26 15:04:41 cloud-hosting crond: postdrop: warning: mail_queue_enter: create file maildrop/909765.2873: No space left on device
Apr 26 15:04:41 cloud-hosting crond: postdrop: warning: mail_queue_enter: create file maildrop/910321.1974: No space left on device
Apr 26 15:04:41 cloud-hosting crond: postdrop: warning: mail_queue_enter: create file maildrop/911333.1975: No space left on device
Apr 26 15:04:42 cloud-hosting crond: postdrop: warning: mail_queue_enter: create file maildrop/26605.1504: No space left on device
Apr 26 15:04:43 cloud-hosting systemd: cwpsrv.service holdoff time over, scheduling restart.
Apr 26 15:04:43 cloud-hosting systemd: cwpsrv-phpfpm.service holdoff time over, scheduling restart.
Apr 26 15:04:43 cloud-hosting systemd: cwp-phpfpm.service holdoff time over, scheduling restart.
Apr 26 15:04:43 cloud-hosting systemd: Stopped The PHP FastCGI Process Manager.
Apr 26 15:04:43 cloud-hosting systemd: Started The PHP FastCGI Process Manager.
Apr 26 15:04:43 cloud-hosting systemd: Stopped The PHP FastCGI Process Manager.
Apr 26 15:04:43 cloud-hosting systemd: Started The PHP FastCGI Process Manager.
Apr 26 15:04:43 cloud-hosting systemd: Stopped CentOS Web Panel service (daemon).
Apr 26 15:04:43 cloud-hosting systemd: cwpsrv.service failed to run 'start-pre' task: No space left on device
Apr 26 15:04:43 cloud-hosting systemd: Failed to start CentOS Web Panel service (daemon).
Apr 26 15:04:43 cloud-hosting systemd: Unit cwpsrv.service entered failed state.
Apr 26 15:04:43 cloud-hosting systemd: cwpsrv.service failed.
Apr 26 15:04:43 cloud-hosting php-fpm: [26-Apr-2020 15:04:43] ERROR: unable to bind listening socket for address '/usr/local/cwp/php71/var/sockets/cwpsrv.sock': No space left on device (28)
Apr 26 15:04:43 cloud-hosting systemd: cwpsrv-phpfpm.service: main process exited, code=exited, status=78/n/a
Apr 26 15:04:43 cloud-hosting php-fpm: [26-Apr-2020 15:04:43] ERROR: FPM initialization failed
Apr 26 15:04:43 cloud-hosting systemd: Unit cwpsrv-phpfpm.service entered failed state.
Apr 26 15:04:43 cloud-hosting systemd: cwpsrv-phpfpm.service failed.
Apr 26 15:04:43 cloud-hosting php-fpm: [26-Apr-2020 15:04:43] ERROR: unable to bind listening socket for address '/usr/local/cwp/php71/var/sockets/cwpsvc.sock': No space left on device (28)
Apr 26 15:04:43 cloud-hosting systemd: cwp-phpfpm.service: main process exited, code=exited, status=78/n/a
Apr 26 15:04:43 cloud-hosting php-fpm: [26-Apr-2020 15:04:43] ERROR: FPM initialization failed
Apr 26 15:04:43 cloud-hosting systemd: Unit cwp-phpfpm.service entered failed state.
Apr 26 15:04:43 cloud-hosting systemd: cwp-phpfpm.service failed.
Apr 26 15:04:47 cloud-hosting crond: postdrop: warning: mail_queue_enter: create file maildrop/204700.3175: No space left on device