Dropping leaf #2??

[Higgins23]

I repotted one of my larger phals about 3 weeks ago after cutting the flower spike off. The roots looked to be in excellent condition. Immediately after repotting it dropped a bottom leaf (totally expected). But now, here we are about 2 weeks later and its large, thick, what I thought was healthy bottom leaf is turning yellow very quickly and will most likely drop too. Is this normal?? It will leave it with only three big green leaves. See pic.