Visitor tracking data goes missing the day after being tracked


I have Piwik 2.1.0 set up on a linux server that is tracking 4 domains.
Since upgrading to 2.1.0 I’ve noticed that on one domain being tracked, getting 4000-5000 visits per day, will sometime lose
all the previous days tracking data about 30 seconds after login into the Piwik interface.
This happens kind of randomly. It will go 3 days collecting data then “poof” the previous day data will disappear.
I suspect this is a issue with auto archiving the data in the mysql database.
I haven’t been able to find any errors in the logs to indicate what is causing this issue.
This only happens on the one domain of the 4 being track the other 3 seem to work as they should.
Has anyone else ran into this issue or figured out a fix?

Here’s a shot of the graph [attachment 1663 piwik_achive_err.jpg]