SALES ORDER: Bill-to Address Randomly Reverts After Being Changed, Cannot Replicate

Sales Order Entry person created an account. Bill-to and ship-to set up as same address until she received the correct bill-to.

In the meantime, she entered a sales order with the addresses as the same.

Received the correct bill-to, updated in customer maintenance and on sales order.

Printed picking ticket. It reverted back to original bill-to address on picking ticket and in sales order. She had to update the sales order again and re-print the picking ticket.

I've tried to replicate this, with no success.

She also said that on other occasions during sales order entry, information in the PO #, Comment Line, and Email have all disappeared. Sometimes it's one field, other times it is all.

Is anyone else having this issue? What should I have her watch to try and establish a pattern?