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I get this exactly when i click tags or favorite menus:

A Question2Answer database query failed when generating this page.

A full description of the failure is available in the web server's error log file.
Q2A version: 8
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I fixed this problem with rest my hosting files manager and i reinstalled the script Q2A  the results are good  
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The error that appears here is a MySQL database error, indicating that the size of the data you are trying to enter into the column named params in the table is larger than the size specified for that column. Specifically, the error "Data too long for column" means that the text you are trying to enter in this column exceeds the maximum length of data allowed.

Solve this problem:

The first solution is by increasing the size of the column: If you have access to the database, you can increase the size of the "params" column in the "qa_eventlog" table to accept larger data.
You can modify the column type using a SQL command such as:

"ALTER TABLE qa_eventlog MODIFY params TEXT;"

Or if you want a much larger size:

"ALTER TABLE qa_eventlog MODIFY params LONGTEXT;"

The second solution is to reduce the size of the entered data:
You can try to reduce the size of the data that is sent to this column, such as specifying a specific length for the subject title, because this field records the event that occurred, such as "User X  sent a new question", and the title of this question is recorded in the "params" column, so it is worth specifying a specific length for the question title.
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