Sonar X1 crashes with UA-25EX

I have a Cakewalk UA-25EX audio card but I think that the problem could be the X1's audio engine: Sonar crashes a lot of times without a specific reason.
There's no importance if I load a new sample into DropZone or a new Dimension Pro preset, it crashes!
And it has crashed also when I press the Play button, so boring!

My soundcard's drivers works good (without latency) only at the maximum "fast" setting (the extreme left of the driver settings panel, where the opposite is "secure", I'm just supposing the right terms in english because my Sonar version is completely translated in Italian ): is this regular?

Is there someone that has fixed this bug?
Many thanks in advance.

What version of Windows? 

Are you using the ASIO driver for the soundcard?

Hi, thanks for your responses.
I have Windows 7 64bit, i think that there are no problems in the RAM because the standard drivers works well with FL Studio.
I'm trying to use the ASIO4ALL drivers (10.0 version) through the soundcard (selecting "ASIO" in the driver mode's setting  and "ASIO4ALL v2 OUT (UA-25EX)" in the control panel), and for now anything crashes!
Until yesterday I've used the "WDM" driver mode (that shows only "OUT (UA-25EX)" in the control panel).

I hope that this could be the right solution.
Sorry for my english.

...and the Sample Rate should not be on 96P or 96R. It is not full duplex at that sample rate.

Nevertheless, I have made these mistakes before myself and it should still not crash.

I've always thought that UA-25EX was 2.0, not 1.1!
Today I've worked a lot with X1 and many projects opened: now I can confirm the absolute absence of problems using the ASIO mode in the driver panel.
The typical audio skipping and popping remains, but this is not a great problem.

The strange thing is that viewing the FL Studio's driver panel, it shows the following drivers (there are two UA25 driver types, this is perfectly regular):
- UA 25EX
- UA 25EX (OUT)
- ASIO 4ALL v2
I've always used the first of the three, and the problems were always very limited, nothing serious about this.
If I chose the second option, the sound becomes very crappy with a lot of pops (exactly as Sonar with the same drivers, but this is typical of UA25, damn -_-).

Sonar X1 views only the "UA-25EX (OUT)" mode of the card's driver and it doesn't view the regular "UA-25EX" driver, so strange (and they are two totally different kind of driver, after a lot of tries with FL Studio)!
I've deducted this from the design of the settings panel, that's identical....in Sonar there's any UA25 regular driver.

At the end, I have to chose imperatively the ASIO driver mode to work decently.

If you use a USB 2 port and run the advanced driver you should be fine. I think you need to configure the ASIO latency and I/O buffers. Give Cake a call and I'm sure you can get running fine. ANother thing is to eliminate and TSR drivers running in the background and disable any wi-fi adapters. Your problem is very fixable.