Fingerprint reader unresponsive on 7490

Hello,

We got two new 7490 and both have the same problem with fingerprint reader:

• Intermittently but often it becomes unresponsive at windows login screen, after windows start, locking or sleep. Like it's not up at all. Sometimes after quite a while (minutes) it starts responding to fingerprint touches, sometimes it's numb and does not response at all and we have to login with pass or pin. What we did is disable power save for fingerprint reader but it did not help. Then we installed latest drivers but that too did not help.
• If fingerprint responds, it has problems reading fingerprint touches, often it does not recognize my fingers (I added several) and I have to login with pin quite often. What we did is try to clean the sensor before touching it but it does not help.

This is very frustrating problem. We are not sure if this is Windows, driver or hardware related fingerprint reader problem. Before we had laptop from other well know brand and fingerprint reader worked flawlessly. 

Since this happens on both of our new 7490 I wonder if anyone else has experienced this and did you manage to resolve this issue.

 Best Regards,

Sasha

ps. I would be quite disappointed if I have to send the notebook back for fingerprint servicing right out of the box.