Probably two months ago I wrote on this forum that time I was solving occasional failures of audio / as when cd leaps /.
Thanks to TIMUR – Smux specialist- , who advised me software DPC Latency Checker /Thesycon GmbH/, I was able to move forward. I had a bright new laptop Lenovo X201i though, in which only Cubase 6 was instaled, even though I had to format HD and get rid of not necessary things Lenovo had installed there. Today I really have there only Windows 7 Professional -32 bit, Cubase 6 and drivers. The problem with over leaping CD was solved but a new one has appeared. It is also occasional but in live applications impermissible.
It expresses as this: I press button Play at Cubase 6.

Cursor runs,  timecode runs, but audio doesn´t play. Audio character activity advice doesn´t show anything. In Cubase it looks as everything works BUT IT DOESN´T PLAY.
When I use software DPC Latency checker in normal condition, when everything is on and everything works, it shows rates around 210 µs.
When I use DPC Latency checker, when Cubase6 is on, but  Fireface UC is off, rate is around 70 µs.
The rates measured with DPC Lat.checker during breakdown / when audio doesn´t play, but everything is on and it should work /, are also around 70 µs.
So it looks like as if during the breakdown driver UC didn´t work or fell over. If this happens I must restart laptop. It happened several times while the song was playing not when I started the song but during playing the song, but Timecode in Cubase was running, cursor was running, but Audio stopped playing.
And maybe some more features which could help:
If I take USB cable out /Fireface UC/ during  the operation from laptopu, Cubase6 switches project into FS 32 KHz and then Blue screen shows.
Lately /approximately 2 weeks/ I have been using older driver 0.964 – supplied on CD, compared to before used 0.984.
It is because I am still looking for solution of the problem.  Interesting is the fact that with older driver the Fireface UC  heats less, and DPC Latency checker shows rates around 210 µs. When I had the latest driver 0.984, those rates were around 320 µs.
And yet as I work. Laptop with Fireface is in the operation 6 days a week, 4-5 hours daily.
I play 6 songs /apr.25 minutes of audio/, then 12 minutes break comes, again 6 songs and break again, and so on. Altogether 4-5 hours. The breakdown happened /10 from 12 cases/, when I played second song after break. It happens approximately twice a week. I am using the latest Bios, the latest drivers: gor graph. card, motherboard.
Thanks in advance for any solution.
For complete view I am attaching my first report from two months ago where complete hardware is shown.

24.07.2011. Hello. I am looking for HELP. I have a problem with occasional audio drop out , approximately every three or four hours. Due to fact that I am working with alive applications it is not allowed. How to install   Windows7, Bios?
Where can problem be?
I have a PC=laptop Lenovo ThinkPad  X201i   type 3323-1YG, Widows7  32bit,  processor Intel Core i3   390M,  disk SSD (flash) OCZ Agility 3,  60Giga. Software Cubase6  32bit.
RAM 4 Giga.
Two microphones are connected into Fireface UC through  Mic. IN 1 XLR and Mic. IN 2 XLR.   Fireface UC is connected into optic cable (via ADAT) + midi cable with  mix Yamaha 01V96 VCM. I use Cubase6 only as player audio+midi = only 1 stereo audio track Fs 44.1, 16 bits + only 1 midi track (only controllers for mix at the beginning and end of files).I don´t use Cubase6 with VST instruments., Efx etc. I use in Cubase only one project which has 16 Giga, and it is approximatelly 20 hours long and has approximatelly 250 songs, which I play by random.
Buffer size = 1024. Latency it is not necessary.
Cubase6 is installed only in  custom configuration without Halion, VST, etc. There isn´t any other software installed in laptop (Office, etc.). Only software, which has come with laptop from lenovo. ( Maybe this has to go away too?)
I tried to turn off hyper-threading.No results.
I do not know where to find the errors.
I don´t want to have!!!!! Internet, printer, scanner, webcamera etc connected to laptop. It should be only  audio+ midi laptop!!! Player!!!
Windows + Cubase are originals. Not crack.
Thank you for HELP
Martin