Recently B4a-Bridge (v2.10) has stopped working during testing on one of my tablets. All the buttons are grey'ed out except the Stop button which doesn't do anything except turn white when I press it. During the problem I see no other non-os apps running. I have done a Force Stop on it but that doesn't clear it. I uninstalled it and re-installed it through the App-Store but that didn't clear it either. The only way to get it working again is to reboot the tablet. This happens about every third or so compile/test. I'm using a 7" Trio Stealth-G2 with Android ver 4.0.4. I have two other tablets that do not do this: a 9.7" Trio 97C Android ver 4.0.4 and a 10.1" Samsung Tab4 Android ver 4.4.2. I am testing your file transfer logic and wondering if its service or wifi connection is interferring.