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By walders
#72034 Thanks all for some great tips :) . As for version, The arduino ide board: nodemcu 1.0, physical board printed on back nodemcu v3

I added the serial.print's in the isr for troubleshooting, I've taken them out and may further reduce what's in isr. I'll also look into iram if I need to.

I was running on various micro usb sources but will add a known stable source for testing.

cheers for now