fix this behaviour
Try this : select a file, choose "4 Edit", modifiy the file, wait for tablet sleeping, wake up, save the file, a message confirms "Cannot save the file", so you lost modifications if tablet goes in sleeping before you save it. (Ghost Commander v1.50.1 on Motorola MZ601 running Android v4.04)
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DUBOIS
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Can not reproduce. If possible email the logcat.