Thank you for your answer
I'm using the right obb versions each time. I have no external sd so tomtom obs folder in in /sdcard/Android/obb
I have this issue with all NDS versions but it can work for several weeks without issues... I tried many things : wipe app cache, force stop app, wipe data & put back the obb, wipe dalvik cache, no background running mode in tomtom parameters but I can't find the problem workaround
so it's really a device specific problem
still investigating
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