With under a gigabyte of space left, worth checking Kodi/DBMC's temporary folder, you might have space hogs in there that can be safely removed.
Reboot (or be 100% sure Kodi/DBMC was shut down properly, open ES File Explorer, expand the "LOCAL" menu, select Home , Android, Data, folder with Kodi or DBMC in name, "files" folder, if you can't see .kodi or .dbmc (as appropiate) folder, expand the "TOOLS" menu on the left, turn on Show Hidden Files, now click on the visible .kodi or .dbmc folder, then the Cache folder, finally Temp folder.
From memory, so a few of these may be slightly off with wording.
Once your in that directory, can long click a file, click the Select All icon, then delete.