Recently I have been experiencing the problem of someone accessing my Facebook account again and again. I have the mobile code feature on in which you have to enter code from your mobile so the person is not able to open my account. But I have to keep on changing the password and it is very annoying. What can I do to stop this? Does Facebook have any additional security features?
Facebook account is accessed from various places many times.
No, there is no problem with your Facebook account.
If you are using any vpn or private network, then Facebook will keep sending you this type of notification. And it you are using a UC Browser on your mobile then very time you will open the account  Facebook will send you the notification. Just stop all the proxies from the devices and system and it will work fine and you will not get any further notification.
Facebook account is accessed from various places many times.
There are many security features available for facebook. This can be best suited solution for the issue mentioned by you.
Login alerts are an extra security feature. When you turn on login alerts, It sends you a text message, email or notification each time whenever someone logs into your account from a any new place.
Steps to turn on login alerts:
1.  Go to your Security Settings
2.  Click on the Login Alerts section.
3.  Check the box next to the type of alert you would like to receive.
4.  Select Save Changes.
5.  Always make sure that you add a mobile number to your account to receive text alerts.