My esp32 Board was doing Brownouts then i attached a lm317 3.3v power supply. It was now working with wifi without problem (serial was ok).
Regulator was ok but resistance was bad.
Attached a 470Uf Cap directly to esp8266 Reg.

Solution:
Check if the traces going to esp32 vcc gnd pins have ...

ESP32 would be everyones mcu if it adds:

Long range LoRa or Another Network
Lowest Sleep Current Consumption (While Interrupts Running)
Small footprint without need of Crystals & Rf balun ( Even QFN )
All IOs accessable while wifi running ( IO's Saperate from Rf)

These four things will change ...