Surprisingly, domain theft is quite common in today's unsafe internet. There are many hackers that spend hours every day trying to hack the login credentials of hosting accounts as that they can steal domains form their rightful owners. Unfortunately, after the domain has been stolen, most thieves change the login credentials and email address associated with the account, so it is nearly impossible to regain control of the domain after it has been stolen. This is especially true if you registered the domain with false information.
One of the best ways to make sure you can always regain ownership of your domain is to purchase domain certification upon registration, print a copy of your dated certificate, sign it, and take all of the necessary security precautions.