Check that there are no paper clips or obstructions in the shredding blades. Try to go 'reverse' to get obstruction out.
http://uk.shopping.com/xPO-Quartet-gbc-5260X-Cross-Cut
I read that it has a 3 year warranty, in case you bought it in this period.
The motor is supposed to be a continuous duty type.
QuartetFor questions regarding Quartet products, call 800-359-1230
I found a toll free number you can call to get more info. on Quartet GBC products.
Perhaps, this will help.