Accounts is Getting Changed in Contacts

Hi,

In dynamics 365 CRM Marketing I am facing issue in contacts.

In contacts the account name is getting changed automatically, I have aligned the correct account name but after few days it gets aligned with some different account name.

For Eg : I created a contact name with Michael and account name is Tmotions but after somedays if I see that contact again the account name will be different.

This has happened multiple times.

Please suggest some solutions.