Hardware: T-Beam T22_V06 20180706
Firmware: SoftRF 1.0-rc4+
Power is supplied from 2A rated 5V power source.
18650 battery is not connected.

The board does not start well.
UART log contains repetitive lines:

EEPROM version: 91
SX1276 RFIC is detected.
WARNING! Barometric pressure sensor is NOT detected.
INFO: TTGO T-Beam GPS module is detected.
WiFi config changed.
new SSID:
Hostname: SoftRF-c5d804
Wait for WiFi connection.
.....
Brownout detector was triggered

"+5V" supply voltage been measured at power switch point with assistance of a DSO shows significant
drop, quite similar to this picture:

I had quite similar issue with my own ESP32-based design. I've resolved it by additional 1000uF capacitance. Please, read this issue for details.

Solution for this issue is full up to you !
I would just suggest you to try to increase value of C47: