Error in ITShop

Hi all, 

Today I saw this error for the first time. I was using it shop and, and when I tried to do a search I saw this banner

"An exception has occured while running the form method Popup0_Popup0_ControlRef1_Container40_ControlRef7_TableSwitchContainer1_GridBand1_gridLoader_ctl02_GridSearchBox.

Exception has been thrown by the target of an invocation

The operation has timed out"

I have IIS and SQL in two different servers in the same network.

I didn't find any useful logs in event viewer or IIS logs

Could it be due to a temporary disconnection between IIS and SQL?

Do you know what that string invokes?

Thanks to anyone who can give me advice