Do not sweat it is normal to lose a couple extensions during the lifetime of the extensions, just save the bond and the bond can be reapplied during next maintenance service.
Do not be alarmed – The average person loses anywhere between 50-100 natural hairs per day, keep in mind when your extensions are removed the hair that would have typically shed is secured within the bond when applied so the hair would not have naturally shed. So it may seem like you are losing more hair but really it is the hair that you would have shed naturally.