I do not have a SF8008, but my suggestion is to clean install in your box, a known to work TNAP version (6 or 7) using the image install from another image/slot, set up a working wifi & password, and run ENIGMA2_DEBUG.trigger, just to verify that dma memory is bad or not. Again I'm not programmer & I do not know anything about this box.All other images I've installed haven't had this problem.
If nothing can be done, too bad.