Intel Rapid Start Technology trouble on a Lenovo Thinkpad

Have clean installed Win7 Ultimate and all necessary drivers on aLenovo Thinkpad X1 Carbon (i5-3427U, 8GB RAM, 256GB SSD).

Intel Rapid Start Technology does work. However, it just turns off automatically every time the machine has woken up from hybrid sleep or restarted, and I have to turn the IRST back on manually using the IRST Manager.

Would appreciate any ideas as to why this might be happening.

Thanks