Magic Mouse loses scrolling ability after sleep

Hi,
I'm on a Mac Pro and got a new Magic Mouse which I really love. First I experienced the BT connectivity problems which many people have on their Mac Pro's which I tried to solve via the tiny Belkin external BT dongle offered in the Apple store.
Now the cursor runs smoothly and I don't have any connectivity problems, BUT after waking the computer from sleep mode, the Magic Mouse lost the scrolling ability. It clicks properly, but I can't scroll.
Everything is fine after restarting the computer.
Searching the net, I found that other users using that dongle don't have the same problem, so what's wrong here? Any ideas? I'm thankful for every hint!

Just want to give an update to my saga.
I have made many calls tonight only to wait to no avail. My last call took 35 min to get thru. After explaining my issues and findings to him in detail, he asked me to do the typical first defense steps. Shut down, and then remove the AC cord. Press the power button 10 sec to "fully discharge any residual power". Then restart. I am all too aware that when Mac goes into sleep (very similar to MS PC's suspend stages) there are different degree of sleep. If I wake it up too soon, the symptoms do not occur. While on the call, we did the sleep and resume twice. Each time I waited about 2 minutes, thinking it is enough for the system to go into deep sleep. In both tries, the mouse did not loss the scroll functions. Thinking the issue may be resolve - though I did have some misgiving about it, I let him go.
I later went back and do a better testing, by let the system stay longer in sleep before waking it. I waited may be 4 to 5 minutes. Sure enough both the mouse and KB failed - both reverted to what seems some sort of basic mode. I have the BT status pane open and so I can monitor what it does. Yes, given enough time eventually the OS reports lost of mouse connection. Then also reports lost of KB connection. Yet, in actuality both the KB and magic mouse still works in their respective basic functions.
It appears that the host BT controller after entering what I infer as deep sleep, it is unable to reconfigure both the KB and mouse to their designed full functions upon resume from sleep. It however, able to reconfigure them for basic functions so the user is not left dead in the  water.
During my call, I ask the CSR what is the next step if the issues are not resolved. He mentioned deleting some sort of BT file somewhere.

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