Had the same on my Wemos D1 Mini (v3)…
If you are using the Platform.io build option make sure you change the LED to pin 2 (as pin 0 is rst!) in the platformio.ini:
src_build_flags = ${common.version} -DWIFI_LED=2 -DENABLE_DEBUG
Essentially every time the Wifi is meant to flash the onboard LED it’s sending a reset because the pin is wrong.
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