Strange problem with new soundcard

Hi guys I`m having a nightmare trying to connect a Motu 624 AVB with a new very powerfull Laptop (Acer Aspire V5-519G)
The audio driver is crashing every time I work with 44.1khz projects.
If i work on 48khz projects for hours it works perfect.
When i connect it with my 8 year old pc it works fine no crashes what so ever,and this pc is much slower.
Motu are doing what they can to help but it is probably an incompatible issue between hardware and software.
Motu Microsoft and Intel something to do with the usb chipset of intel.
 
This was a fully working laptop for this last year had no issues with it tracking 16 tracks of 48khz 24 bit audio for long periods.
Still I made a fresh install of everything including bios ,firmware and drivers directly from Acer official site.
Any info would be greatly app. before i go and get a cheap HP or soemthing more compatable with Motu cause I need this for live performance urgently.
Thanks
Peace

Have you tried disabling on-board audio (including HDMI based drivers)? Do you have any third party drivers like ASIO4ALL or Jack on your system (even if you're not using them)?

Since Windows Media Player crashes too, that points to a PC problem rather than a problem with the MOTU or Sonar. 
 
Was this upgraded to Win 10 or did it come with Win 10?  I see one reference to this model with a 2014 date that suggests it came with Win 7 or Win 8?  If this is the case, a "clean" Win 10 install may be needed, assuming all the hardware is fully Win 10 compatible.  
 

If you got it in 2015 with Win 10 home it may be a pre release version and not the full final version.  That again may be the problem.  
 
Go to the Settings Panel and the System and then About.  Report what Version and OS Build you have.

I would check with Motu if they support the Creators update for W10. It might be that they only support up to 1607 (anniversary update).
Another thing.. How did you connect the Motu? AVB or USB 3?

maltastudio
usb 3.0 that`s what giving me the problem,the chipset of intel i`ve been told in another forum.
By the way on windows you cannot connect it with cat 5 only on mac you can.
Peace

Yep, that's the problem 90% of the time with newer systems.  Especially if you notice that the interface works just fine on your older system.

i'm thinking, tyring to help ... but the obvious was suggested already ...
 
following this thread as a MOTU user 
 
BTW, the 624 was one of the first interfaces to come out with a USB3 (not USB2) port in the back ... and here's what they claim in their marketing material
With 32 and 34 channels of audio I/O, respectively, the 624 and 8A connect to any computer with Thunderbolt™ or super-speed USB3, which is, of course, backward compatible with USB2.
New optimized MOTU drivers deliver industry-leading, ultra-low round-trip latency (RTL) performance as low as 1.6 ms at 96kHz over Thunderbolt with high-performance DAW hosts (with a 32-sample host buffer). Over USB3 (or USB2), RTL performance is an astonishing 1.9 ms. Generally speaking, the main advantage of USB3 is the increased bus bandwidth, with latency performance for both USB2 and USB3 within a few hundredths of a millisecond of Thunderbolt. Both USB 3.0 and Thunderbolt support up to 128 channels of input and output to and from the computer (at 44.1 or 48 kHz). That's 256 simultaneous audio channels!

I'm still stuck on the report that Windows Media Player doesn't play 44.1khz audio files, which suggests a basic PC/Windows problem.  That needs to be fixed before even considering the MOTU.

Too bad.  I would suspect a corrupted Win 10 install.  I would download and install the latest version of Win 10, direct from Microsoft and start with that.  Only install any needed drivers from Acer (Win will install many drivers if you are on line (or able to go on line) when you do the install. 
 
See this thread from the www.tenforums.com  about how to download and install the creators upgrade version of Win 10 direct from Microsoft.  
 
https://www.tenforums.com/tutorials/9230-download-windows-10-iso-file.html
 
 

I'll agree on the USB 3.0.  However, you reported Windows Media Player would not play 44.1Khz files, and that has nothing to do with Sonar or your MOTU unit.  That is a Windows problem or some other application you have running.