What a strange phrase.
"ALL OF A SUDDEN"...also known as Suddenly : . 1. Happening without previous notice or with very brief notice; coming unexpectedly, or without the common preparation; immediate; instant; speedy.
If something happens with limited notice, is it appropriate to say it happened 'SOME of a sudden'? If more than adequate notice has been given, would that be 'NONE of a sudden'?
Suddenly I have a headache behind my eye.