I have a Raspberry Pi which is only used to display a web page on a screen. The pi connects to the internet over Wifi. When I'm on the same wifi I used to connect to my pi through SSH or VNC viewer using the default user "pi" and "raspberry" as password.
A few days ago I couldn't connect. When trying SSH I got: "Authentication failed, permission denied". Similar error with VNC.
I reset the password ("sudo passwd pi"). Problem solved, SSH access restored... VNC viewer worked as wel. But after 5 to 10 minutes, the password no longer worked. Resetting pw again still works, but only temporarily.
So it seems my password keeps changing? What can be the cause?