Cannot Connect to Octoprint Anymore

[dreadbiscuit]

**What is the problem?
-I have been using OcotoPi (Version 0.15.1) for a few weeks flawlessly over wifi connected to my Original Prusa i3 mk3. I sent a print to it this morning, which finished - and now I cannot login to the Octopi server (raspberry pi 3b+)
What did you already try to solve it?
-I logged in to my router and it still sees my device as connected on the same IP address that I have been using.
-I tried pinging it with no return (using cmd.exe)
-I tried SSH connection via PuTTy with no success
-I restarted the OctoPi server with no success
Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware, octoprint.log, serial.log or output on terminal tab, ...)
-I am using Windows 10 (also tried via my iPhone and iPad with no success). Looking for options before I reformat the SD and start from scratch...