What is the problem?
After hours of normal operation on previous days, I fire up my Octopi and Ender 3 to print. 15 minutes into a 2 hour print, the connection to the Ender 3 via USB cable is lost. I reboot everything, and it won't reconnect. After some trouble shooting, I find that the USB cable is hot (read: warm). This says to me that the printer is drawing too much current. I googled around some, and found some posts saying a powered USB hub could remedy the issue. I just find it confusing because it's been working fine, and my power supply should be more than capable of supplying enough current. Nothing else is remotely warm (raspberry pi, buck-boost ps, etc.)
What did you already try to solve it?
I switched USB cables, and the same symptom. Checked the voltages on my buck-boost power supply. No issues there. My cables are 3 feet long. I've printed for probably 40 hours on the same set-up. Nothing has changed.
serial.log or output on terminal tab, browser error console ...)
Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ...)
I'm at work right now, so I can't really check (I never put the OctoPrint server across my firewall).
My Ender 3 is running Marlin 1.8 with BL Touch.