In the process of my efforts yesterday, I also switched to a different Pi. I think the one I'm on now is a 3B+. I just took a look and the same problem is occurring this morning. From the log, it looks like the modem is just cycling every few seconds... which seems to be causing those gateway errors. Nothing in dmesg that is noteworthy. And I am using a brand new power supply of relatively good quality now.

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On Thu, Dec 5, 2019 at 07:40 PM, Colby Ross W1BSB wrote:
Curious, what model Pi do you have?