PDAnet stops working after a little while?

I've been using PDAnet off and on for quite some time now. Last night, I tried something new: Keeping the PDAnet app open on my iPhone 4s all night, while trying to upload a video to YouTube. When I woke up, it was disconnected (not physically disconnected, but I had to right click on the icon in the taskbar to connect it again). Can someone please help me out with this?

Also, if it's possible, I'd love to use the Wi-Fi Hotspot app they offer, but I can't turn on my Wi-Fi- it's greyed out.

I had the same problem

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