Touch sometimes stops working for me if I've had the keyboard attached and then it goes into sleep mode. I then take the keyboard off and wake it up with touch only. I hit the button to wake the pc, but then touch does not register at all when trying to log in. I usually have to attach the keyboard again and reboot to get touch to work again.
In fact, I'm having a lot of issues coming out of sleep and hibernation. Sometimes my network adapter gets disabled during sleep and I can't get it enabled again without a reboot. It usually results in a blue screen and DRIVER_POWER_STATE_FAILURE error.
I'm trying to be patient with Windows 10. I know there will be more updates to come and hopefully in a few months all of these kinks will be worked out.