There is a bug in ICS for the a100/a200/a500 series tablets that apparently causes this condition for anyone using the GPS. The problem is not a bug in Copilot, but Copilot users see it more often merely because of their frequent use of GPS. It is a file leak that causes a build up of files in /data/gps. It was apparently delivered with Android 4.0.3 to all a100/a200/a500 series tablets. You'll probably need to periodically clean out your /data/gps directory using a file manager such as ES File Explorer. Factory data reset is the only option for non-rooted users, which is probably why Acer support recommended that. You state that you already have root privilege. You'll need that to see and remove the files. The files that are not automatically being cleaned up use to the following naming convention: gl-YYYY-MM-DD-HHMMSS.txt (example: gl-2012-06-25-235959.txt)
I don't know exactly what the Acer support people were telling you, but they are responsible for this software and this bug.