I'm strongly recommending you to install hive keychain
@yabapmatt/hive-keychain-now-available-on-chrome-and-brave
You will need to enter your master password and it will import and store all your hive keys. You will have no problems with power down and transfers
I hope Hive account@theycallmedan or someone from Hive account@threespeak will help you with the login issue on their site