System Hang in Ubuntu Mate

I have successfully installed Ubuntu Mate on the eMMC board and am able to boot the system. What is strange is that when I open Firefox and have a couple of tabs open, the system will suddenly hang and the keyboard and mouse are frozen. I power-reset the system and everything comes back working correctly. After a while it will freeze up again. Finally, I just decided to try a few things and what I discovered was that if I unplugged the USB plug for my combination wireless mouse and keyboard then plugged it back in, everything unfroze and both mouse and keyboard were working again. I don't know why this occurs, but wanted to let others know. 


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