I have the same mobile, a susan x8 I got it recently and its doing the exact same thing - saying there's insufficient space when all that's used is barely 2gb and its saying there's 6.5 GB of free space but it continues to give me error msg's (927, -8 and another one with letters and numbers that I can't remember plus even "insufficient space in default storage space" msg), I've cleared caches - didn't work, then cleared catches and data after forcing google play store then Google play framework and also download manager apps to stop - didn't work, I then uninstalled the updates for these apps - didn't work, so then I removed my google account and set it back up again - didn't work, eventually I factory reset the phone and that didn't work either, does anyone have any move idea's?
Oh and I've done this over WiFi only and had already ticked allow third party installs so I'm pretty stumped at this point and hope someone else who reads this can help me with this tech issue , thanks - r-jay101