Hi everyone,   I just got my helix (second hand, like new) Most of the time, no problems and I'm also very satisfied with my tone so far. But sometimes it just won't boot. The boot screen acts normal, with the moving spirals etc., but it doesn't disappear and the home screen doesn't come. Added to that, the top left of the display reads ":-28" in red characters. (See the Image attached)   I believe I saw this happen with FW 2.10 which was loaded when I bought it. Now I'm on 2.12 and I sti