Toast sending messages help

[Aitken]

I'm on EE orange and my nexus wasn't receiving messages properly this morning but it seems to be sorted now. Now every other hour a toast message will randomly pop up at the bottom of the screen saying 'sending...'
any help?

 

[anon(847090)]

open message app and see if there is a hanged message(with resending on red) on the message lisr and delete the unsend.resending message