I would suggest checking that you have actually downloaded the latest firmware version (it should be 4.11.11980) from the Device Info page. The version upon release had a bug that caused the Forma to freeze unexpectedly, but that was immediately fixed.
If it's not that, download the last firmware from the first post in
this thread. To install it, you'll need to unzip the contents of the file inside the /.kobo folder of your device, after connecting it to your computer. Then, disconnect and wait for the device to reboot and update.