Jesus was not human when he gave the gospel to Paul (Gal. 1:12), and later he was again not human when he made Paul an apostle (Gal. 1:1). Then later he became human again when Paul wrote to Timothy (1 Tim. 2:5). But the Bible does not say if he is human today in the 21st century. So we cannot know if he is human now or not. Clearly God changes his nature according to what God needs.
Similarly Jesus is sometimes spirit and sometimes not a spirit. Clearly the reason must be the same. But whether Jesus changes being God and not God, we cannot know.