Wireless Network failure leads to CPU usage at 100%

Have Latitude D800 with Dell True Mobile 1300 WLAN MiniPCI Card.   Several weeks ago, started having intermittent problems with the wireless network connection failure, and then having CPU Usage climb to 100% and staying there. 

 

Computer could run all day without the problem surfacing, or problem might surface immediately after booting.  Application load appears to have no bearing on when the issue appears: sometimes the load is heavy, othertimes very light.

 

Not uncommon for problem to surface when waking from Windows standard screensaver after period of inactivity.

 

Task Manager reveals no unusual processes accessing the CPU ( System Idle processes still shows at 90+% of the CPU usage)

 

Have run Antivirus, Spyware and Registry Cleaning  tools and believe machine to be "clean".

 

Opened msconfig and disabled most all startup items but problem still appears.

 

Problem seems to disappear when I disable the Dell TrueMobile 1300 WLAN Mini-PCI card.

When  the card is enabled and functioning normally,  connectivity will be fine for "a while" and will for no apparent reason lose connection with wireless network (other machines in office remain connected).  This is when (perhaps coincidentally) the CPU usage skyrockets and stays pegged at 100%.

 

When at 100%, mouse and keyboard response drops to nearly nothing, with significant delay times. Machine then usually has to be hardbooted and cannot be shut down normally.

 

I downloaded and reinstalled fresh drivers for the device.

 

I ran the Dell Diagnostics (thorough version) and all tests passed fine.

 

Is anyone familiar with Wireless networking cards failing and resulting in CPU usage escalation?

 

has me puzzled....