Each departure and re-entry restarts the 90-day clock; your next check-in will be 90 days from your most recent date of arrival.
You may have to report your address on a TM30, this year it changed that if your returning to the same address you don't have to report, however, some offices still want you to report, check with them.
I have kbank and Bangkok bank Internet banking, hardly use them, there not getting much development work very old technology, I suspect they will go sometime in the future. Everyone is using a smart phone.
indeed, I think they use a variety of inputs to ensure your verfied in thier eyes. The other big one being which visa you hold. They appear to be much more joined up, closing an AIS and bank account at the same time, amazing 😆 🤣 😂 😹 😆