Piwik no longer tracks the visitor overnight

Hi everybody !
Piwik is really a great tool , I used hugely until yesterday. But suddenly , Piwik has started to not record user visits while no changes were made ​​to the configuration, as well as to my wordpress site and plugin.
I nevertheless notes that Piwik happens to retrieve information but granular manner ( A visitor this morning at 1am (Fr Time) while there were other visits in between) .

I tried to remove my site and put the Piwik , but it did not solve my problem.

Help me please : D


please check out: Piwik doesn't track any visits and pages, and shows "There is no data for this report" in all reports. - Analytics Platform - Piwik for some pointers and maybe this will help you?