It seems to me that if he was good enough, he'd have nailed a starting place by now not struggling for game time.
After all we aren't exactly blessed in the midfield department.

Perhaps he isn't as committed as the managers he's been under would like.

Could it be that he is disillusioned with his stop start career and not working hard enough.

I have to agree that a loan to a League 1 or 2 seems the ideal move.