Is this an issue?

I’m just wondering, if this is something that needs medical attention.

So after we have sex, and my husband cums. He can’t seem to go another round like his dick completely dies down. Sometimes, I am left unsatisfied and no matter what after he cums he can’t seem to get his dick back up again.

I mean is this an issue or completely normal for a man to just die down like this after cumming the once?