Automatic bcc

You're welcome. Glad it is straightened out. It sounds like you are speaking of the Key Flicks, where you can get numbers by flicking the letter key downwards without having to change to the numbers keys. If that is the case, you go to Settings>General>Keyboards and turn on the switch for Enable Key Flicks. If this is not it, how about a screenshot of the keyboard with a marker to show what you are referring to.

ChrisJ4203 has offered sage advice in working through this problem.

Deleting the email account from your device - and then re-adding the account - is not the major issue that you apparently perceive.

I would recommend just one additional step…

After deleting the email account from the iPad, perform a forced-restart of the iPad - before re-adding the email account:

• On an iPad with a Home button: Press and hold the top button and the Home button at the same time. When the Apple logo appears, release both buttons.
• On other iPad models: Press and quickly release the volume up button, press and quickly release the volume down button, then press and hold the top button. When the Apple logo appears, release the button.

Not knowing what you consider "normal fixes", have you tried deleting the account from the iPad, then power cycle the iPad, then add the account back. I'm guessing you may mean that you have turned off the Bcc switch and turned it back on again?

Deleting an email account is not drastic. And one would not lose mail unless you have a POP account instead of IMAP or Exchange. POP is the only one that stores mail on your device. The others I listed store the mail on the server and sync that to your device. If this is an intermittent issue, it may be difficult to diagnose, or it could be something about the account itself.

You're welcome.