Its unfortunate that they don't keep the drivers current. However I know of many users who still use the VS-700 successfully so someone may have additional tips for you. Are you running the latest drivers? It may be worth trying to uninstall and reinstall the driver to make sure its set up right. 
 
Were you able to load your project after switching out of ASIO mode (maybe MME or WDM)? You can also try loading the project after unplugging the device.

Noel Borthwick [Cakewalk]
Its unfortunate that they don't keep the drivers current. However I know of many users who still use the VS-700 successfully so someone may have additional tips for you. Are you running the latest drivers? It may be worth trying to uninstall and reinstall the driver to make sure its set up right. 
 
Were you able to load your project after switching out of ASIO mode (maybe MME or WDM)? You can also try loading the project after unplugging the device.

 
Yes I tried to run my project on WDM , same issue. I also did uninstall and reinstall the latest version but no difference.
I ended up to unload the KONTAKT and try in different way.
Again thanks for your following up.

Hmm if removing Kontakt fixed the crash it would seem to imply that loading the project with Kontakt was corrupting memory and causing the driver to crash. Memory corruption can lead to some unpredictable crashes like that.

I also have a history of Kontakt messing up some projects, which with the help of Noel and Cakewalk staff got traced to the VS700 (and also Octa-Capture) driver crashing, thus crashing Sonar.
 
When researching NI forum (long time ago) I came across a "known" issue with these Roland drivers, which never got addressed properly from either side (neither NI nor Roland) - VS700 is no legacy, so no hope there from Roland ... don't think NI will care much about an issue with a legacy driver, either. Bad luck.
 
However, experiencing that problem (not regularly but still a couple of times in recent years) I developed some habits when using Kontakt to avoid this - and what helped a lot was to freeze Kontakt ASAP i.e.

• use several Kontakt instances just using a single instrument (instead of one with many instruments) so you can freeze/unfreeze per instrument
• freeze before you save and exit (which will avoid this fail upon project open issue you just experienced)
• maybe these days you can synth record and simply archive original Kontakt tracks for faster workaround (but that you might have to test carefully, not sure if it works as good as the other workaround)

Thanks guys for your information. So what is the best option now for me to choose a good converter? I don't mind to spend around 4k but I really want to get something with no hustle and good support.  As I said I was told there is a possibility to run sonar on apogee symphony connected to protools HD card on PC. Is that true?
I need minimum 8 XRL in and 8 Out (any type). It seems the best quality and affordable unit in market is apogee. I am not sure if I am right or wrong. 

reza
Thanks guys for your information. So what is the best option now for me to choose a good converter? I don't mind to spend around 4k but I really want to get something with no hustle and good support.  As I said I was told there is a possibility to run sonar on apogee symphony connected to protools HD card on PC. Is that true?
I need minimum 8 XRL in and 8 Out (any type). It seems the best quality and affordable unit in market is apogee. I am not sure if I am right or wrong. 

For 2K you get a superb interface from RME or the latest MOTU - both with excellent drivers and more I/O than you specified.  For 4K you might even be able to aim higher e.g. interfaces from Lynx ...

Rob[atSound-Rehab]

reza
Thanks guys for your information. So what is the best option now for me to choose a good converter? I don't mind to spend around 4k but I really want to get something with no hustle and good support.  As I said I was told there is a possibility to run sonar on apogee symphony connected to protools HD card on PC. Is that true?
I need minimum 8 XRL in and 8 Out (any type). It seems the best quality and affordable unit in market is apogee. I am not sure if I am right or wrong. 

For 2K you get a superb interface from RME or the latest MOTU - both with excellent drivers and more I/O than you specified.  For 4K you might even be able to aim higher e.g. interfaces from Lynx ...

Thanks Rob.
Between Lynx and Apogee which one you recommend ? quality and stability. 

reza
Thanks Rob.
Between Lynx and Apogee which one you recommend ? quality and stability. 

sorry, i'm the wrong person to ask as I own/use neither of the two - maybe post in the hardware forum to get feedback from people who owned one of these devices for a while ...

Hi. Sorry for just jumping in, but. I have the RME Ucx.
If you have the opportunity to buy RME, you will not be disappointed. Low latency, and very stable drivers.
Mine has not given me a single problem in the year or so I have had it. 
This might very well be my last AI ever
All the best.