No, but read on 😀
There are indeed some scholars who are of the view that backbiting and lying invalidate fasting. However, the majority of the scholars view otherwise. It is unanimous, however, that backbiting is a major sin – it is akin to eating the flesh of your dead friend – and it is something that we would want to avoid at all times, especially during this blessed month of Ramadan. Fasting is not mere abstinence from food, drinks and sexual relations, but from one’s evil thoughts and actions as well.
Like you know, blaming others (or even inanimate objects – like an alarm clock) to create excuses for ourselves from having to perform our religious obligations 😀