Bluetooth icon with two rays, what this means?

My bluetooth stops working from time to time on my MB (unibody late 2008), anyway just restarting the MB solves it. Now I'm trying to find why, because restarting is not an option for me.
So my question is:
I noticed that wen this happened, the bluetooth icon turns to a bluetooth icon with two horizontal little rays (or zigzag lines)
Technically, what this means?
Also another question, overcharge the USB ports with USB powered devices can make bluetooth stop working this way?
Thanks

Yeah,
This has a lot of sense, because this start happening after I added a new USB device that uses almost 500ma. Anyway this new device is connected to a different USB Bus.
This the distribution:
USB Bus
-nio 2|4 (soundcard) 500mA
-BRCM2046 Hub
-Bluetooth USB Host Controller <---
USB Bus
- Apple Internal Keyboard/Trackpad 40mA
- IR Reciver 100mA
USB High-Speed Bus
USB High-Speed Bus
- Built-in iSight 500mA
- USB2.0 Hub
- ReMOTE SL (MIDI controller) 480mA
- Launchpad (MIDI controller) 430mA <--- the new device
Now some questions:
If I use a powered USB hub, it could improve my situation?
If it is possible: turning off USB devices I'm not using, like the IR Receiver and iSight, could improve my situation?
Because this not happens every time I use this configuration, I think it could be related to AC stability problems, do you think an AC NoBreak or Stabilizer can improve my situation?
Last issues (it happens 3 times) was in Israel where AC wasn't too stable and a bit below 220V. Now I'm in Malaga Spain working with a 227V AC supply for more than 48 hours non stop with all devices working, and no signals of any problem.
Thanks for your help!

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