How to keep bluetooth connectivity in standby mode with a Dell X51v ?

[louyaorong]

I have a Dell X51v and a HTC universal, both of them have been upgraded to wm6. When I use the universal(I removed the sim card and disabled the phone function), I connect it to a Nokia mobilephone E61 through bluetooth and let the E61 as a bluetooth modem. And when the universal turn into standby mode after several minutes I don't use it, the connection is still keep alive. But when I use the X51v instead of the universal by the same method, there is a problem,that is when the X51v turn into standby mode,the bluetooth of X51v automatically turned off,and it disconnect with Nokia E61,and the internet connect is lost.

It's really drive me mad. As I want to use X51v to get windows live messenger online all the day.But the problem makes it impossible.But why the universal is OK?Can the X51v perform just as universal?Just not to disable the bluetooth funtion when in standby mode?

wait for a method,Thank you.