Keeps 3 days refrigerated. Rice dries out when reheated — add a splash of broth and cover. Cool quickly and refrigerate within an hour, as with any cooked rice. Freezing works but softens the rice.
Not enough liquid, or the lid wasn't tight. Rice above the liquid line cooks by steam alone, so a good seal matters — foil under the lid helps.
Not well, since the chicken needs searing first. Sear in a pan, then transfer everything to the rice cooker if you prefer.
2:1 liquid to rice here, slightly generous because the chicken absorbs some and the dish shouldn't be dry.