user disappeared, admin recreated??

Hi,

Today I could not log in to one of my routers with my own username, so after a few minutes I gave it a try and managed to log in with admin and no pass. What the hell?
I recreated my login, logged out and after a few minutes tried to log in again, with no luck, it reverted back to admin again. No other setting is affected, debug log shows nothing except what I actually did.
It is a x86 5.13 which has been running for 6 months now.

Please help, because this is really serious.

Thanks,
Andras

Upgrade to 5.18 and see if it still happens. If so, send supout and bug description to support@mikrotik.com

Thank you for the reply.

It seems the HDD burnt out and the RouterOS was running from memory, otherwise perfectly.