Some processes don't start

[SamR1]

It concerns mostly process.py.

supervisor logs :

2016-09-04 18:59:43,863 CRIT Supervisor running as root (no user in config file)
2016-09-04 18:59:43,864 WARN Included extra file "/etc/supervisor/conf.d/supervisor_citizenwatt.conf" during parsing
2016-09-04 18:59:44,830 INFO RPC interface 'supervisor' initialized
2016-09-04 18:59:44,831 CRIT Server 'unix_http_server' running without any HTTP authentication checking
2016-09-04 18:59:44,838 INFO daemonizing the supervisord process
2016-09-04 18:59:44,841 INFO supervisord started with pid 597
2016-09-04 18:59:45,848 INFO spawned: 'process' with pid 624
2016-09-04 18:59:45,857 INFO spawned: 'receive' with pid 625
2016-09-04 18:59:45,864 INFO spawned: 'visu' with pid 626
2016-09-04 18:59:46,701 INFO exited: receive (exit status 1; not expected)
2016-09-04 18:59:47,708 INFO spawned: 'receive' with pid 896
2016-09-04 18:59:48,058 INFO exited: receive (exit status 1; not expected)
2016-09-04 18:59:50,066 INFO spawned: 'receive' with pid 930
2016-09-04 18:59:50,856 INFO exited: receive (exit status 1; not expected)
2016-09-04 18:59:53,923 INFO spawned: 'receive' with pid 1029
2016-09-04 18:59:53,926 INFO exited: process (exit status 1; not expected)
2016-09-04 18:59:54,253 INFO exited: receive (exit status 1; not expected)
2016-09-04 18:59:55,297 INFO spawned: 'process' with pid 1030
2016-09-04 18:59:56,300 INFO success: visu entered RUNNING state, process has stayed up for > than 10 seconds (startsecs)
2016-09-04 18:59:57,982 INFO exited: process (exit status 1; not expected)
2016-09-04 18:59:58,989 INFO spawned: 'receive' with pid 1058
2016-09-04 18:59:59,271 INFO exited: receive (exit status 1; not expected)
2016-09-04 19:00:00,278 INFO spawned: 'process' with pid 1059
2016-09-04 19:00:03,847 INFO exited: process (exit status 1; not expected)
2016-09-04 19:00:04,852 INFO spawned: 'receive' with pid 1076
2016-09-04 19:00:06,864 INFO spawned: 'process' with pid 1077
2016-09-04 19:00:09,337 INFO exited: process (exit status 1; not expected)
2016-09-04 19:00:13,352 INFO spawned: 'process' with pid 1093
2016-09-04 19:00:15,359 INFO success: receive entered RUNNING state, process has stayed up for > than 10 seconds (startsecs)
(...)
2016-09-04 19:01:18,434 INFO spawned: 'process' with pid 1304
2016-09-04 19:01:22,071 INFO exited: process (exit status 1; not expected)
2016-09-04 19:01:23,073 INFO gave up: process entered FATAL state, too many start retries too quickly