Thanks, and to you as well.

Its not off both cores. You can further prove that by pinning it to either core 0 or core 1. Also, Core 0 (IDLE0 13) is 100%-13% = 87% idle time. Also, Core 1 (IDLE1 25) is 100%-25% = 75% idle time. So you can see it's still pretty much spending most of its time twiddling its fingers waiting for som...

I really doubt its a current inrush issue. I have seen on a few boards now from different people who improperly use the onboard serial chip to control the reset and GPIO0. What I would do, its take your scope or meter and make sure that GPIO0 is bulled up to 3.3v when you plug it in. If its low at p...

Cool! thanks for sharing!

Try
#define RXD2 16
#define TXD2 17


HardwareSerial Serial2(2);
Serial2.begin(115200, SERIAL_8N1, RXD2, TXD2);

@threeboys is right, His example does not work, nor does this one. It resets as well.
https://techtutorialsx.com/2019/04/07/e ... eb-server/

Why haven't you posted your code. How can we help if no one here has a clue what you have done, or what example you are trying to use.

Have a look at this thread
viewtopic.php?f=2&t=13275