Giant auto mode dropping out

[Kentrider]

hi.... my wife has just got a Giant trance x e2... she is getting used to it and wanted to leave it in auto mode for now, but after a while, the blue light goes off and three lights come on and she says it just stays in one mode and doesn't change assistance automaticly... if she turns off the power and back on again its fine for a few minutes again.... any ideas? thanks