I started having problems with Sonar stability early yesterday.  Audio would crackle and fizzle out.  Changing app focus would bring it back.  A few minutes later it would futz out again.
 
Then I noticed my shift key acted like a control key ...
 
I checked the battery status on the keyboard and it was too low for the app to read the level.  Changed the batteries and everything is back to normal.
 
This particular keyboard/mouse (Logitech) has the little USB receiver.  Apparently when the keyboard gets low on juice it reaks havoc on the USB subsystem.
 
Check your batteries once in a while!!  :)
 
EDITed to include 'wireless' in the subject

Very true.  One other warning on mice, for DAW's it is best to get a generic mouse.  I have found that for those that like gaming mice, or high DPI laser mice, can often interfere with any USB Audio interface and your DAW's performance as they tend to have very high bus interrupt rates.  If you have a FW or PCI based sound card, you may not see these issues.

denverdrummer
Very true.  One other warning on mice, for DAW's it is best to get a generic mouse.  I have found that for those that like gaming mice, or high DPI laser mice, can often interfere with any USB Audio interface and your DAW's performance as they tend to have very high bus interrupt rates.  If you have a FW or PCI based sound card, you may not see these issues.

Interestingly, I have a Logitech G600 (wireless/wired) USB mouse which also has a decent DPI which I use for gaming/DAW.
Fortunately, it's been behaving very well and not caused any issues (that I've noticed) when I'm on my DAW. However, I've noticed that it does need to be charged (via included USB wire) somewhat regularly......especially when gaming.   
Now, I'm going to be on the lookout for those high bus interruptions.
 

This mouse doesn't give me any problems ...

Logitech mice tend to be well behaved and have good drivers. Also the high polling rate isn't really an issue. You can turn it down, if needed, but in general systems these days can service interrupts like that very quickly, they don't hamper performance much.

 I'm getting to hate these keyboards that have the blue tooth adapter.  I have a Logitech one where I can boot into a BIOS.  You move a certain you lose connectivity.  I replaced a Logitech Combo because it would eat batteries.  It had to plug in the blue tooth adapter to a cable that came from an old Belkin wireless adapter.
 
 I may go back to the PS/2 ports. 

I've never liked using wireless mice. The battery adds significant weight and I prefer a lightweight mouse. In my previous job, I used to have to spend long continuous periods of time doing fine detailed editing work. Avoiding wrist strain was essential.
 

Kev999
I've never liked using wireless mice. The battery adds significant weight and I prefer a lightweight mouse. In my previous job, I used to have to spend long continuous periods of time doing fine detailed editing work. Avoiding wrist strain was essential.
 

For me size matters more than weight.  A heavy mouse is OK, but smaller mice cause hands cramps.

I have a Microsoft Bluetooth Mouse and Keyboard. 
They've both been spot on...great products!

I too am using a wireless (probably Bluetooth) Microsoft keyboard and mouse, no problems in Sonar or anything else.
The keyboard model is a "Wireless 2000". 

I had a Logitech wireless (Bluetooth) keyboard and mouse combo that I bought at Sam's Club.  It had problems, both with the keyboard and mouse on the same system that the Microsoft works perfectly on.  I returned it to Sam's Club.