Octoprint disconnects from printer after a minute or so

I received my Prusa i3 MK3S last week. During the weekend I assembled it and have printed several parts already, each time transferring the gcode through an SD card. Now I am trying to get Octoprint to work on my Raspberry Pi 3B+ to control and monitor the printer. Everything connects, the status changes to "operational", but after about a minute or so it mentions it has lost communication with the printer.

I tried reconnecting, rebooting the raspberry pi, rebooting the printer, ... None of these helped. But since I'm a total newbie to this, I really don't know what else to do.

Terminal mentions the following :

Connecting to: /dev/ttyACM0
Changing monitoring state from "Offline" to "Opening serial port"
Connected to: Serial<id=0x6864b150, open=True>(port='/dev/ttyACM0', baudrate=115200, bytesize=8, parity='N', stopbits=1, timeout=10.0, xonxoff=False, rtscts=False, dsrdtr=False), starting monitor
Starting baud rate detection...
Changing monitoring state from "Opening serial port" to "Detecting baudrate"
Trying baudrate: 115200
Send: N0 M110 N0125
Recv: start
Changing monitoring state from "Detecting baudrate" to "Operational"
Send: N0 M110 N0
125
Communication timeout while idle, trying to trigger response from printer. Configure long running commands or increase communication timeout if that happens regularly on specific commands or long moves.
Send: N1 M11539
Communication timeout while idle, trying to trigger response from printer. Configure long running commands or increase communication timeout if that happens regularly on specific commands or long moves.
Send: N2 M21
18
No response from printer after 3 consecutive communication timeouts, considering it dead. Configure long running commands or increase communication timeout if that happens regularly on specific commands or long moves.
Changing monitoring state from "Operational" to "Offline (Error: Too many consecutive timeouts, printer still connected and alive?)"

OctoPrint version : 1.3.11
OctoPi version : 0.16.0
printer : Prusa i3 MK3S
firmware : 3.7.2-2370
browser : Safari 12.1.2
operating system : Mac OS 10.14.6

From what I understand about the Prusa is that there is some way of telling it that your Pi isn't soldered on to some board.

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