Seems MMDVMHost will continuously look for the modem if it gets disconnected. Here's a truncated log, from when I turned off the radio to after a couple of minutes, when I turned it back on again. Frequency and other settings were passed on to the radio when it came back on.
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E: 2020-02-28 05:25:37.849 Error when reading from the modem
E: 2020-02-28 05:25:37.854 Error from read(), errno=6
E: 2020-02-28 05:25:37.854 Error when reading from the modem
E: 2020-02-28 05:25:37.854 Error from read(), errno=6
E: 2020-02-28 05:25:37.854 Error when reading from the modem
E: 2020-02-28 05:25:37.859 No reply from the modem for some time, resetting it
M: 2020-02-28 05:25:37.860 Closing the MMDVM
M: 2020-02-28 05:25:39.868 Opening the MMDVM
E: 2020-02-28 05:25:39.868 Cannot open device - /dev/tty.usbmodem1411
M: 2020-02-28 05:25:44.877 Opening the MMDVM
E: 2020-02-28 05:25:44.877 Cannot open device - /dev/tty.usbmodem1411
M: 2020-02-28 05:25:49.884 Opening the MMDVM
E: 2020-02-28 05:25:49.884 Cannot open device - /dev/tty.usbmodem1411
M: 2020-02-28 05:25:54.893 Opening the MMDVM
E: 2020-02-28 05:25:54.893 Cannot open device - /dev/tty.usbmodem1411
M: 2020-02-28 05:25:59.902 Opening the MMDVM
E: 2020-02-28 05:25:59.902 Cannot open device - /dev/tty.usbmodem1411
M: 2020-02-28 05:26:04.906 Opening the MMDVM
E: 2020-02-28 05:26:04.907 Cannot open device - /dev/tty.usbmodem1411
M: 2020-02-28 05:26:09.910 Opening the MMDVM
E: 2020-02-28 05:26:09.911 Cannot open device - /dev/tty.usbmodem1411
M: 2020-02-28 05:26:14.915 Opening the MMDVM
E: 2020-02-28 05:26:14.915 Cannot open device - /dev/tty.usbmodem1411
M: 2020-02-28 05:26:19.918 Opening the MMDVM
E: 2020-02-28 05:26:19.918 Cannot open device - /dev/tty.usbmodem1411
M: 2020-02-28 05:26:24.922 Opening the MMDVM
E: 2020-02-28 05:26:24.922 Cannot open device - /dev/tty.usbmodem1411
M: 2020-02-28 05:26:29.924 Opening the MMDVM
E: 2020-02-28 05:26:29.924 Cannot open device - /dev/tty.usbmodem1411
M: 2020-02-28 05:26:34.926 Opening the MMDVM
E: 2020-02-28 05:26:34.927 Cannot open device - /dev/tty.usbmodem1411
M: 2020-02-28 05:26:39.932 Opening the MMDVM
E: 2020-02-28 05:26:39.932 Cannot open device - /dev/tty.usbmodem1411
M: 2020-02-28 05:26:44.934 Opening the MMDVM
E: 2020-02-28 05:26:44.934 Cannot open device - /dev/tty.usbmodem1411
M: 2020-02-28 05:26:49.935 Opening the MMDVM
E: 2020-02-28 05:26:49.935 Cannot open device - /dev/tty.usbmodem1411
M: 2020-02-28 05:26:54.938 Opening the MMDVM
E: 2020-02-28 05:26:54.938 Cannot open device - /dev/tty.usbmodem1411
M: 2020-02-28 05:26:59.942 Opening the MMDVM
E: 2020-02-28 05:26:59.942 Cannot open device - /dev/tty.usbmodem1411
M: 2020-02-28 05:27:04.944 Opening the MMDVM
E: 2020-02-28 05:27:04.944 Cannot open device - /dev/tty.usbmodem1411
M: 2020-02-28 05:27:09.946 Opening the MMDVM
I: 2020-02-28 05:27:11.965 MMDVM protocol version: 1, description: OpenGD77 Hotspot v0.1.0 GitID #3c26b73
E: 2020-02-28 05:27:11.988 DMR, Connection to the master has timed out, retrying connection
M: 2020-02-28 05:27:11.988 DMR, Closing DMR Network
M: 2020-02-28 05:27:11.988 DMR, Opening DMR Network
M: 2020-02-28 05:27:22.284 DMR, Logged into the master successfully