Interesting, so you logging in with regular login method (not steemconnect). And you are using your posting private key, is that correct? I see that you made your last post from mobile app which means it should be working. Helps us to reproduce this issue, what you did or how did you get this issue, did you enable/disable pin code or did you logout and login or added different accounts, etc.
RE: ESTM mining, use cases and investment opportunities