150Mb available space on your device is definitely not enough.
I'm putting together a new post for the How To site, aimed at finding what needs to be deleted when low on space.
(spoiler: ES File Explorer, Tools menu, SD Card Analyst, Wait a long time, Scroll down to All Files and find where the biggest files or collections of files are residing).
Will leave this tab open and update with the post's address if the spoiler isn't enough.
[edit]
It will be up at
https://droidbox.co.uk/how-to/running-low-can-bring-you-down/ at some point this weekend.
In place now. No video, but the words and pictures should be enough if you use your DroidBOX at the time of reading.