Hi hashtag, we normally only change passwords for accounts when the account is being used in a suspicious manner. Do you have a good up to date antivirus running along with a good malware checker? If you're account keeps getting locked either you're making 10 login attempts often or the suspicious behaviour is a problem.
Please log in to My Account if you need to view or pay your bill, manage boosts and track your usage. From My Account you can also check your connection and test your line for any issues in the Service Centre.