@Fran ****
you never want to let the banks handle your monthly deposits because if you switch to using the monthly income method for retirement visa and you don't manually do the transfer, eventually it's going to get screwed up and you won't be able to get your extension the next year.
You have to show the transfer every single month, and there are many reasons this can be broken.
Holidays causing the transfer to be a few days early or late.
Technical glitch causing the same.
Budget or government shutdown causing checks to not be issued for a few weeks.
It's just not worth the risk to let them handle it. Do like Jackie said and do it yourself so you know it's correct.