Jetpack Show a error at the top of each page

Hello there i have installed jetpack latest version and wordpress 3.3.1 and w3 total cache and all are up to date.
My problem is after some configuration of w3tc i have noticed that sometimes there is a error at the top of each page appearing alternately that is sometimes it is there and sometimes it is no there
the error is :

Couldn't connect to database server.Couldn't find database jqueryc_db.An unexpected problem has occured with the application.
SELECT statscurl_id FROM <code>statscurl</code> WHERE statscurl_ip = '';

i am sure that this error is caused by jetpack and not any other plugin because is says “statscurl_id” and “statscurl_ip” as i think these thinks are related to the visitors info that is user agent and the ip,etc and these thinks are only required by jetpack for generating site reports(stats)
Also that i would like to mention that this error is occured after i have reconfigured the w3tc plugin, in page cache settings
i have just changed Garbage collection interval to 300 sec.
and cache preload Update interval to 120 sec.
Also i want to mention that if someone visits my site for first time there is the error at the top of the page but if he/she refreshes the page or visits the site again the error is gone, but the same problem occurs again for the 4th or 5th visit i am amazed that what is exactly happening
Please help.

https://www.ads-software.com/extend/plugins/jetpack/