Have a look at this

https://help.ableton.com/...zing-Windows-for-Audio

A few things after reading this. 
The USB 3.0 issue. What I have found is if you use a USB 2 extension cable, your USB 3.0 port becomes USB 2.0 speeds. So not sure if this also makes a USB 3.0 port behave like a USB 2.0. But it certainly seems so. 
 
Sonar LE -  I have the X1 LE version came with my Roland A 49. It seems to work the same as my other versions as far as set up and general layout. But it's a bit of a waist of time otherwise. Home Studio is 100% better. 
I don't think Sonar is wise to even hand out LE as it will turn more off of Sonar than win over. 
It would make more sense to hand out an extended free trial of Home Studio or even Plat. 
 
Losing Audio - Often on board audio drivers can take over Sonar. This I've seem a lot here on the forum. " All my other music programs work all except Sonar" 
Sonar it would seem is a little more picky about driver environment. This is not a bad thing overall . The solution is often to completely remove all other audio drivers so there can be no conflict. 
PCI audio cards, HDMI audio, Creative Labs and asio4all installed drivers are  known to kick proper ASIO drivers out of Sonar.  
 
I'm sure you've followed this, but a Tascam interface driver install requires you "wait until your told" before you turn it on or plug in the USB cable during installation. 
 
Have you tried power the interface with a power supply? USB buss power is not the greatest idea. Handy for a laptop at a gig, but I would always use wall power at home. 
 
 
 

Quite true about the USB. I plug devices straight in rather than use a cable for that exact reason.
 
I tried disabling all audio devices (even HDMI) through device manager and same issue.
 
For the installation, same for everything since pretty much USB1 devices. Install, wait to be told before you plug in (or until after installation is finished).
 
Didn't come with the power adapter, I asked when I brought it about the power and they told me its only really needed if you are plugging into a laptop or something with low power output.

FWIW, I'm using a Tascam 2x2 plugged into a USB 3.0 port on my laptop, no external power supply, and it works okay. I reserve the ASIO driver for Sonar; everything else runs through the default Windows sound device (the Realtek internal sound card).
 
I ran into the issue you're describing the other day with a screen capture program. I was using Sonar, then opened the other program and tried to set it to "receive" the ASIO output. When I switched back to Sonar, the drivers had disappeared, and I had to log out of Windows and back in to get them back in Sonar.
 
I think you'd be okay using the ASIO drivers with Ableton Live or other music programs, as long as you don't try using Sonar at the same time - at least, that's been my experience.
 
Getting Sonar to work properly with the hardware has been a struggle for as long as I've been using Cakewalk products, but the trade-off is that Sonar is a joy to use, and the bakers continue to refine and improve it. Best of luck to you!

It seems the best course is uninstall sonar and just stick to other software.

I can't say I'd blame you with all the trouble you've had. But like I said, I've kept with it for years, despite the quirks, because it's so much fun to use once you get the kinks ironed out.

I wish it was just get the kinks out. When it just flat refuses to work and even with everyones help here its still a no go. Its just time to flag it completely. If it takes more than 5 hours to get a simple piece of software working (nothing to do with learning it, I'm talking just getting it running), is it really worth it?
 
 
If I had managed to solve the issues and get it up and running I'd at least have accomplished something. Instead I feel that I've wasted 1/2 a day for no gain. Is it worth more hours? IDK. Really, I could spend another 4 or 5 hours installing and uninstalling and reconfiguring. It all just seems to create more work to get everything else running again afterwards.
 
No live support at all, the only support is from the community (which is an awesome bunch of folks btw). Its just a pity the software and official channels are so far below what you would expect from a company that has been around as long as they have.
 
I have to say, cakewalk was no cakewalk. Its just a disappointment.
 
 
 
...I miss the days when software worked and was easy to set up and use.

Does your Tascam work with any other audio program? Media Player? 

Works with everything else

Actually that is good news. What version of Sonar LE do you have and list your system specs. CPU, memory HDs and so on. Which Windows are you running?