I get a reboot cycle with this output, roughly every 9 seconds:
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ets Jan 8 2013,rst cause:4, boot mode:(3,6)
wdt reset
load 0x40100000, len 30712, room 16
tail 8
chksum 0xd5
load 0x3ffe8000, len 996, room 0
tail 4
chksum 0x2e
load 0x3ffe83f0, len 1064, room 4
tail 4
chksum 0xfd
csum 0xfd
���o�r��o|�l$ll ��r�l�$�$ ��r�l�l�$`��{�p����$l
This is on a laptop USB port, I have tried several laptops, older versions of micropython etc. I also flashed them with tasmota with no issues at all, that works and they can be set up to connect to a wifi hotspot so I don't think the boards are broken. I am flashing with esptool flash mode=dio and I tried the others, also flashing with different versions of esptool.
Finally I turned off the wifi hotspot on my desk, and got straight to a repl prompt! I have a mesh wifi system, so that means there are several hotspots visible with the same SSID name. I am going to continue experimentation, but I think that the issue might be that it is scanning the slightly complex wifi environment and a watch dog timer is tripping without being fed and it reboots.
Anyone else seeing this kind of reboot cycle? Is there a way to disable or extend the watch dog timer?