Unhappy Cannot find my device in My WIFI Router, help!

Hi friends, did you use this software - My WIFI Router( mywifirouter.me )? I use this software to create a wifi hotspot on my windows 7 laptop. All my devices, such as iPad, Nesus 4 can connect to the internet through the this virtual router, and it runs perfectly.

But today, I cannot find my device name in the connecting device list shown in this software panel, but my Nesus 4 still can connect the internet. After I restart this software, my Nesus 4 can found again.
PS:The screenshot of the problem shown below:
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I want to know does anyone encounter this problem?