Drop Outs And Flickering Lights in AI

Hey Guys and Gals!!!

I have a concern. Currently using M-audio Fast track Ultra 8R Audio Interface but experience too often drop outs in Sonar and/or all the lights flick in the AI and sound stops while DAW continues to play. Often having to restart the program. Was considering buying a new AI (I'm hearing Focusrite is good) but then ran into an article stating that not all AIs works well with all DAWs. I am also considering purchasing a new Thunderbolt PC from PCAudioLabs dedicated more towards studio work.

Here's the questions:

-In fact how long will AIs last?

-Could I be the culprit, maybe my settings are wrong/AI getting old?

-Has anyone encountered issues using Focusrite Thunderbolt, Sonar Platinum and Win 10 (would rather stick with win 7)? If so what works well?

Current Stats:
M-audio Audio Interface USB
Dell 09 Ispirion 546
Win7 Pro (I'm scared of 10... Lol)
AMD Athlon II x4 630 2.80GHz
8GB RAM
64bit OS
500GB internal HD (core and programs)
1TB external HD (projects, waves etc)
Dual screen monitors
PC Desktop speakers w/sub
Pair KRK Rokit 6 monitors
USB M-Audio Midi Keystation 49es
AKAI Renaissance

And of Course Sonar LE, Home Studio, 8 Pro, X2, X3 and Platinum... Lol

Thx

I used to have one of those Fastrack Ultra 8R's.  Wasn't a bad unit but is dated and maybe not even supported anymore.  But the lights flickering in the unit and audio stops would appear to most likely be a hardware problem in the unit.  
 
Thunderbolt is still iffy in Windows and Microsoft support is the same way.  According to our forum expert who builds DAW PC's we are not even reaching the full capabilities of USB 2.0 and many units have low latency that is equal to or close to Thunderbolt.  
 
I have an MOTU unit and a Focusrite 6i6 2nd generation as a backup unit.  The MOTU has much better latency, features and control program.   I have a desktop for DAW but also just bought a Laptop for uses other than a DAW but I have installed Sonar and my MOTU and initial tests are it works well.  I will use the Laptop for any "on site" type recordings (I have one coming up later this month).  The new Dell is marketed as a "gaming Laptop" so the spec's are fairly good and it comes with an SSD drive.  It boots up and runs, visually, as fast as my high end desktop.  Its an Inspiron 15, 5577 model.  

The flickering lights thing makes me suspect a problem with either the USB cable or the USB socket on the interface, PC or both. Especially if a light that shows USB connectivity is flickering. Another possibility is a power supply problem, which might be the interface or whatever mains connection it's plugged into.

As for how long interfaces last, the answer to that question is the same as the answer to "how long is a rubber band?"

Better built interfaces should last longer, and even inexpensive electronics can have a long lifetime, but eventually time catches up with everything and components start to go out of speciication, make noise or just fail.