Keyboard from MacBook Pro 'not found' after waking from sleep mode

The last few days I've been having problems with the keyboard from my MacBook Pro.

Nearly every time after I closed/not use my Macbook for a while, putting it in sleep mode, and I open my MacBook, starting it up again, it won't find/recognise the keyboard and touchpad rom the Macbook....

After I force a shut down of my Macbook, and re-start it, it works fine again, until its been in sleep mode again, and I have to restart my MacBook again.

Anyone any idea to why? And how to fix it?