If you are on a mobile hotspot, WIFI, or similar, these may change IP addresses. Only your hosting provider would be able to answer if your server is behind a proxy.
If you would like to provide access, I can take a look to see why this isn't saving or if it too is related to you getting logged out:
We would need to look further into this for you, however the access details on file appear to be incorrect or missing. Could you please update these details by visiting your client area, selecting the relevant purchase, then clicking "Review/Update Access Information" under the "Stored Access Information" section.
We look forward to further assisting you.