Have heard the current vaccines are probably already outdated and keeping up with the changes is going to be almost impossible. This was info from a Dr.Bossch.
That would be natural. SARS-CoV-2, like other viruses, is not going to remain static.
Its why, if you get vaccinated for influenza, you should get one every year as there are new strains/variants all the time. That, and antibody levels may decline over time.