Hi there. My name is*****'m sorry that you are having this problem. I will do my best to help you with this. I think a factory reset would be the logical next step. The good news is that you won't lose all of your books. The reset to factory defaults will of course remove them from the reader but they will be restored when you sync your Kobo via wifi or via connection to your computer.
By the way, I see that you had to wait for quite some time for help. I am sorry about that.
Here is further information on Factory Resetting the Kobo Glo:
Performing a factory reset
If a basic reset doesn't work, you can perform a factory reset to restore your eReader to its original settings. After a factory reset, you’ll have to set up and sync your eReader again.
If you perform a factory reset on your eReader, you'll:
Performing a manual factory reset
If a basic reset and a factory reset don't work, you can try a manual factory reset to restore your eReader to its original settings. After a manual factory reset, you'll need to set up and sync your eReader again. Before you perform a manual factory reset, charge your eReader for at least four hours.
Setting up your eReader after a factory reset
After you've performed a factory reset on your eReader, you'll need to set it up again.
Please give this a try and let me know how it works for you. If this solves the problem, would you mind taking a moment to rate my service? I'd really appreciate it! Without a rating I am not credited for my answer. If this doesn't solve the problem be sure to let me know so we can continue troubleshooting.
Here's a link to the Kobo Glo user manual. I thought it might be helpful.