Hidden WiFi network always forgotten

The WiFi network I use is hidden.[1] The Kobo Glo works fine with this network but only for a single task, for example synchronizing the library. Once the Kobo disconnects from the network it forgets about it and I need to re-enter the network name and its password. It takes three such manual re-insertions to buy a single book.

Is this a known problem? Is there a solution or a workaround?

Also, what is the correct way to report bugs to Kobo developers?

[1] I do not administer this network, I just use it and I cannot change the way it is provided to us users.