My user is automatically reset

Sorry for my english, My language is Spanish
Y have the problem, in x86, Licence Level 4

this morning, I could not log in with my username or password, and I could only enter with the default username and password, i change the login, but after 20 minutes login reset again.
I can not access the console, it does not show me the prompt (atach image).
I can not see the files

the router os , will be installed in a flash memory 16gb

I appreciate the help you can give me,

Erwin
error mikrotik.JPG

Log files? CPU usage? Profile.

I can not see the log, or any other file on the disk.

CPU Ussage 3%-5%

solvedd!!!
my flash memory is the problem