Same problem with my P4 and LE10. Probably it came up after recent Update to 10.0.1, but I'm not sure. My wired connection used to connect automatically. But after I have tried manual, I am not able to save the change when I set the slider back to automatic.
I tried the same with the wireless connection. After I had activated wifi, I left the automatic setting. Then I changed to manual and guess what: I wasn’t able to save the settings when I set the slider back to automatic.
Is there a way to edit a LE config file directly to make the change there instead of via Kodi-LE menu?
I upload the log/journal to http://ix.io/3Ex9. But I think it doesn't make sense to run journal export a second time as the amendment in the network configuration isn't saved anyway.