The Koala was working fine for several weeks. Then this issue started happening.
My devices (iPad, iPhone, Wii U) can no longer connect to Koala. I reset the Koala (press button on side for 1 second) and it fixes it and the devices can connect again. But anywhere from 2 minutes to 20 minutes later they disconnect and cannot reconnect.
This is my second Koala, the first one worked without any problems for 2+ years before it stopped working completely. This is a replacement Koala.