Does the bag have lots of holes? There needs to be lots of ventilation. You can also use a mesh net bag (the same bag bunches of onions come in) or just mound them in a bowl. Wash and scrub them before use.

> in my laundry room

Put a hygrometer in that room (you can buy a pack of 20 little battery-powered hygrometers from Amazon for $10). If the humidity is above 50, it's too humid. If you don't have another dark dry room, you can put a dessicant in the room to absorb humidity.