ESP32 DevKit WIFI+BLE WebServer POST problem

Hello everyone!
I'm using ESP32 DevKit with espruino_2v00_esp32
Flashed:
python "../../esptool/esptool.py" --chip esp32 --port COM6 --baud 921600 --after hard_reset write_flash-z --flash_mode dio --flash_freq 40m --flash_size detect 0x1000 bootloader.bin 0x8000 partitions_espruino.bin 0x10000 espruino_esp32.bin

ESP on startup connects to my local Wifi and create Web Server that serves web page. I can connect to this Web Server and get web page without any problem. JS on page generates every 2 seconds GET request and receives JSON string. All OK. But when I'm starting send POST request after several such requests Web Server not responses anymore . Also I noticed that after every POST increases memory usage.
So I need your help... Is it my code or something else?

Console Log:

____                 _
|  __|___ ___ ___ _ _|_|___ ___
|  __|_ -| . |  _| | | |   | . |
|____|___|  _|_| |___|_|_|_|___|
         |_| espruino.com
 2v00 (c) 2018 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
>Initialization...
Starting...
Connecting to WiFi...
Connect to http://10.10.10.100
WARNING: setsockopt(SO_REUSPORT) failed
>process.memory(); // <--- After code upload
={ free: 2174, usage: 626, total: 2800, history: 601,
  gc: 0, gctime: 2.607 }
>process.memory(); // <--- After connection to web server
={ free: 2134, usage: 666, total: 2800, history: 604,
  gc: 0, gctime: 2.634 }
{"mode":0}
>process.memory(); // <--- POST received
={ free: 2037, usage: 763, total: 2800, history: 604,
  gc: 0, gctime: 2.727 }
{"mode":1}
>process.memory(); // <--- POST received
={ free: 1940, usage: 860, total: 2800, history: 604,
  gc: 0, gctime: 2.989 }
{"mode":0}
>process.memory(); // <--- POST received
={ free: 1844, usage: 956, total: 2800, history: 604,
  gc: 0, gctime: 2.88 }
{"mode":3}
>process.memory(); // <--- POST received
={ free: 1746, usage: 1054, total: 2800, history: 604,
  gc: 0, gctime: 2.962 }
{"mode":4}
>process.memory(); // <--- POST received
={ free: 1650, usage: 1150, total: 2800, history: 604,
  gc: 0, gctime: 3.037 }
{"mode":4}
>process.memory(); // <--- POST received
={ free: 1552, usage: 1248, total: 2800, history: 604,
  gc: 0, gctime: 3.13 }
>process.memory(); // <--- POST not received / No response
={ free: 1552, usage: 1248, total: 2800, history: 604,
  gc: 0, gctime: 3.126 }
>process.memory();
={ free: 1552, usage: 1248, total: 2800, history: 604,
  gc: 0, gctime: 3.126 }
>E.getErrorFlags();
=[  ]
>console.log(mode);
0
=undefined

// Button pressed --->  [ CRASH ] ---> :(

>/mnt/c/Users/rhys/esp32/EspruinoBuildTools/esp32/build/esp-idf/components/freertos/./queue.c:1442 (xQueueGenericReceive)- assert failed!
abort() was called at PC 0x4008a168 on core 0
Backtrace: 0x4008c743:0x3ffdbf90 0x4008c76f:0x3ffdbfb0 0x4008a168:0x3ffdbfd0 0x40107bda:0x3ffdc010 0x40109f04:0x3ffdc030 0x4010a253:0x3ffdc050 0x4010b536:0x3ffdc0a0 0x40136075:0x3ffdc120 0x401af1b1:0x3ffdc150 0x40135229:0x3ffdc170 0x401597fa:0x3ffdc1b0 0x4012e394:0x3ffdc210 0x4012999f:0x3ffdc230 0x40129b05:0x3ffdc2a0 0x4014a845:0x3ffdc2c0
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:2
load:0x3fff0018,len:4
load:0x3fff001c,len:2364
load:0x40078000,len:0
load:0x40078000,len:10880
entry 0x40078c4c
E (29) boot: ota data partition invalid, falling back to factory
Loading 1654 bytes from flash...
WARNING: setsockopt(SO_REUSPORT) failed
>