What always called Shakespeare back from working on his sonnets?

This question makes a load of silly and unnecessary assumptions about the composition of Shakespeare's sonnets. How do we know that anything ever "called him back" from working on sonnets? It could well be that he got an idea for a Sonnet, then wrote it down immediately, then delivered it to someone, perhaps, and that was all. There is no reason to suppose that Shakespeare wrote the sonnets with a view to having them published in one volume in 1609; rather the contrary, I should think.

But even if one were to suppose that his composition of a sonnet was interrupted by something, why in the world should you suppose it was always the same thing? Can we not imagine something like this:

Shakespeare: Shall I compare thee to a bale of hay? Thou art more scratchy . . . no, that's no good.

Heminges: Will! Come here!

Shakespeare: Just a minute, John. Shall I compare thee to a lousy play? Thou art more profitless . . . no! No!

Heminges: Everyone is going to the tavern for a drink. Want to come? Don't mope around here. What a waste of a summer's day!

Shakespeare: All right, all right . . .hmm, "summer's day"? Oh well, I can get back to that later.