I do not personally think password change is any red flag as it's one of recommended security practices.
But it is true that when some account has it's password changed recently/frequently, it might get under radar of people who check for hacked/sold accounts, so they can reward that account with proper trust rating.
I always think of BTT as a highly valuable platform. I'm in fear that my BTT account would get compromised someday if I saved my password in an online place. So I never saved my password anywhere. (I know I should have used a diary to note down my password.)
Use offline password manager. I myself use password safe [1] on my android. Encrypt it and make backups regularly, so even if someone somehow gets access to the cloud file, he can't have access to the data without knowing the password.
Stake your Bitcoin address as an alternative way to secure your account [2].
[1]
Password Safe[2]
Re: Stake your Bitcoin address here