Illustrator keyboard shortcuts have gone.. all sticky?

Hi I love using keyboard shortcuts in Illustrator but since I've upgraded to CC Illustrator on both my computers acts as if the keys are covered in glue

when trying to use keyboard shortcuts.

I'll hit the keyboard shortcut for the retangle tool for instance, nothing, strange I think, hit the keyboard again harder, nothing, strange I think and hit again

harder, again and again and on the 8th or 10th time it suddenly works. This is repeated on most keyboard shortcuts on and off, not every time.

This is consistent and new since CC upgrade across both machines.

Any ideas please anyone.

I've been using illustrator since 1989 and never seen this problem before.

Thanks