When i log off my laptop the keyboard stops working

I have windows7 installed on my laptop and any time i log off my system or just keep it idle for sometime it logs off and the keybaord starts behaving differently.

Like when i press the j key it reads it as 1

when i press f it reads it 4 and so on.

So i have to switch off the laptop and then turn it back on to make it work correctly any help?

That's extremely odd behavior. Did this problem happen suddenly? Do you recall what you did prior to it happening (like opening an e-mail attachment or visiting a new website)? First, before any other troubleshooting, make sure your anti-virus is up to date and run a malware scan (e.g. MalwareBytes). If it's not a virus, it may be due to a fault with the keyboard driver. Perhaps you have an older laptop and a recent Windows update created a conflict? You could also try going to the Device Manager, select your keyboard, and then check to see if there's a driver update.