Hi Dave
Mine has been working well when regarding the blackouts: never happens anymore. To save battery I sometimes when sitting in the dark set the screen contrast to 0% then the battery lasts for ages. (but as is clear battery is not a good point as well of the X98 pro)
Every now and then my WIFI driver gets corrupted and I had to revert to a backup image (I use Macrium Reflect for this, highly recommended)
Regarding the space on the tablet I have considered to wipe the Android partitions from within Windows using computer manager (storage manager). However I read many people advising NOT to do this as there are a total of about 16 partitions and if you wipe the wrong one(s) you cannot boot anymore.
So I keep to my motto that I always respect when it comes to computer equipment: if it aint broken dont fix it!!
Cheers
Dennis