I've got familiar with Android not long ago. Having almost no experience, I carelessly installed Busybox, and after that the system started resetting itself after each power-off. It also didn't allow to install software from internal storage anymore saying that there was no space.
Luckily, this question helped me out. Quite sceptical at first, I installed a file manager from external USB and moved busybox from
/system/bin/, and surprisingly, the problem was gone.
But could anyone tell why busybox executable placed in
xbin was causing these problems?