Alexa (Echo) with ESP32 and ESP8266 – Voice Controlled Relay

I interfaced my ESP32  with the Alexa as the tutorial says, it worked just fine for about 2 weeks, I was able to turn on and off 3 switches that are interfaced with the ESP32. Now the Alexa seem to respond but the ESP32 constantly resets with the error shown below, Would you know what this error code means and why the ESP32  is no longer responding to the Alexa.

[WIFI] Connecting to ATTZHkwbJA ..

[WIFI] STATION Mode, SSID: ATTZHkwbJA, IP address: 192.168.1.92
[MAIN] Free heap: 253296 bytes
[MAIN] Free heap: 253296 bytes
[MAIN] Free heap: 253132 bytes
[MAIN] Free heap: 252944 bytes
[MAIN] Device #5 (Outlet 3) state: ON value: 255
Outlet 3 switched by Alexa
send =13
send =13
Guru Meditation Error: Core  1 panic’ed (LoadProhibited). Exception was unhandled.
Core 1 register dump:
PC      : 0x400d427f  PS      : 0x00060330  A0      : 0x800d2f21  A1      : 0x3ffcd770
A2      : 0x00000000  A3      : 0x00000000  A4      : 0x3ffce61c  A5      : 0x00000000
A6      : 0x3ffce5d4  A7      : 0x00000000  A8      : 0x80089836  A9      : 0x3ffcd730
A10     : 0x00000000  A11     : 0x00000000  A12     : 0x00000001  A13     : 0x00000001
A14     : 0x00060320  A15     : 0x00000000  SAR     : 0x0000000a  EXCCAUSE: 0x0000001c
EXCVADDR: 0x00000000  LBEG    : 0x4000c2e0  LEND    : 0x4000c2f6  LCOUNT  : 0xffffffff
Backtrace: 0x400d427f:0x3ffcd770 0x400d2f1e:0x3ffcd790 0x400d4456:0x3ffcd7b0 0x400d44ed:0x3ffcd7e0 0x400d463e:0x3ffcd820 0x400d465e:0x3ffcd860 0x400d48fe:0x3ffcd880 0x40088b6d:0x3ffcd8b0
Rebooting…
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:1
load:0x3fff0018,len:4
load:0x3fff001c,len:1100
load:0x40078000,len:9564
ho 0 tail 12 room 4
load:0x40080400,len:6320
entry 0x400806a8
[WIFI] Connecting to ATTZHkwbJA ..
[WIFI] STATION Mode, SSID: ATTZHkwbJA, IP address: 192.168.1.92
[MAIN] Free heap: 253312 bytes
[MAIN] Free heap: 253312 bytes
[MAIN] Free heap: 253312 bytes
[MAIN] Free heap: 253312 bytes
[MAIN] Free heap: 253312 bytes
[MAIN] Free heap: 252912 bytes
[MAIN] Free heap: 252912 bytes
[MAIN] Free heap: 252912 bytes
[MAIN] Free heap: 252912 bytes
[MAIN] Free heap: 252912 bytes

the alexa discovers the esp32 and it says ok when i say alexa turn on outlet 1 or outlet 2, but the esp32 only resets when alexa sends the command

the esp32 responds with the error code shown in my initial post, once receiving command from alexa the esp32 sends an integer value by i2c to a pcf8574 each outlet command from the alexa

corresponds to a certain integer value sent to the pcf8574.