Brownout detector was triggered? error on connecting WIFI

Hi,

When I run the WIFI sample from the documentation my board initially would connect but on subsequent code upload would reset preceded by this message:

Brownout detector was triggered
ets Jun  8 2016 00:22:57
rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:2364
load:0x40078000,len:0
load:0x40078000,len:10880
entry 0x40078c4c
E (28) boot: ota data partition invalid, falling back to factory
WARNING: has simple connection not implemented yet
Loading 1566 bytes from flash...

Do I have a bad board?

Thanks!