Help New fault - won't charge unless turned off?

[tenchy]

Yesterday my nexus developed an annoying issue.
Went home, plugged in the standard charger, didn't kick into life. Fiddled about withit, differentoutlets etc. NNothing.
Figured charger packed in.
Tried the daughter's, same.

So tried it with the phone turned off. Worked then!

Same happened again tonight.

I haven't updated on installed anything in last few days.

Anyone come across this and fixed it?