Hi zenu,
There is a firmware update that should help with the issue. Let's perform the following steps to download and install the software:
1. Click HERE to launch the download page.
2. Select "Operating System" It should automatically be detected.
3. Under the "Firmware" section you will need to download the file [Mac] MF8280Cw Firmware Update Tool (V04.08). After reading the details and disclaimer, click I Agree to terms. Download and save the file to your computer. Once the download is complete, double-click the file from its download location to begin the installation.
If you continue to have difficulties, please contact our support group using the following link:
http://Canon.us/ContactLI