Photoshop playing up


Photoshop keeps playing up. All of a sudden the shift keys stop working and the space bar doesnt work to move around canvas. I then have to restart for it to start working again. But then after a while the same problem occurs.

Please can anyone help? I would be most grateful.

Thanks in advance.
frist things first- test the keyboard. Are you have problems with key recognition in any other programs? Try another keyboard.
Do you have a tablet plugged in?

Can I have more info before making a recommendation?
What OS are you on, and which version of PS are you having trouble with?
what kind of Mac are you using?
What version of PS did you originally install on that machine?