If one slept with the intention of fasting the next day to expiate a broken vow, but he missed the suhur due to oversleeping, can he break the fast and try another day (with suhur) just to make it easier or must we continue fasting. (i.e. Breaking it is haram)?
You are not allowed to break the fasting of expiating a vow without a valid excuse. You can only break a voluntary fasting.