Piwik + php5-fpm + fastCGI error 503

Hello,
I have got weird problem.
I am running piwik on server, where is working php-fpm and fastCGI. It works on wordpress websites, so there is no problem with it.
I have script, which restarts php-fpm, when there is a website having 503 error.
that script restarts about ten times circa at 7 pm php-fpm because of piwik. rest of the day it’s okay.
Can you help me ? What can be the problem?
Errors in apache log:
[Wed Apr 15 06:35:19.685923 2015] [proxy_fcgi:error] [pid 20694] [client IP] AH01067: Failed to read FastCGI header
[Wed Apr 15 06:35:19.685998 2015] [proxy_fcgi:error] [pid 20694] (104)Connection reset by peer: [client IP] AH01075: Error dispatching request to :
[Wed Apr 15 06:40:22.666633 2015] [proxy_fcgi:error] [pid 21000] [client IP] AH01067: Failed to read FastCGI header
[Wed Apr 15 06:40:22.666678 2015] [proxy_fcgi:error] [pid 21000] (104)Connection reset by peer: [client IP] AH01075: Error dispatching request to :

Have you been able to solve this? I’m getting the same error.