FlashCrash from wifi

[HardyM]

OK, I've hit a real doozey of an issue.
I have a program greatly evolved from the ESP32 -> camera -> CameraWebServer example.
My app pings the internet every minute - like a health check. Works fine.
Put if I ping or make any request for a URL load, then the system flash gets wiped.
Serial monitor is random. Right now its repeating this

Code: [Select all] [Expand/Collapse]

1. rst:0x10 (RTCWDT_RTC_RESET),boot:0x3b (SPI_FAST_FLASH_BOOT)
2. flash read err, 1000
3. ets_main.c 371
4. ets Jun  8 2016 00:22:57

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but it varies. Previous crashes are like this.

Code: [Select all] [Expand/Collapse]

1. s⸮⸮x10 (*⸮]Q}I⸮C_RESEU⸮I⸮⸮⸮⸮0x3b (S⸮}MQ}LASH_Bꊕj
2. flX.⸮⸮⸮⸮⸮err, 1⸮⸮
3. et⸮Յ⸮⸮⸮c⸮71
4. ets Ju⸮⸮⸮⸮⸮ 00:&&⸮⸮j
5. C!⸮.⸮⸮⸮⸮0 (R⸮]Q}IQC_RESQU⸮I⸮⸮t:0x3,B⸮A%}FASTe1M!}BOOT)C!+͡read*⸮ɱ ⸮⸮0
6. ⸮⸮}⸮⸮⸮⸮9c 371j
7. ets ⸮⸮⸮⸮⸮16 0⸮22:5SH⸮
8. r.⸮⸮⸮⸮0BRTCW⸮⸮%Q
9. }ISET),⸮⸮⸮0Mb (S⸮ReMQ}FLASH%==Q⸮
10. ⸮+͡⸮⸮YX*⸮ɱ 1000C⸮W}⸮⸮⸮n.c ⸮Sj
11. etsRչ⸮ 8⸮016 0⸮22:5SH⸮
12. r⸮⸮⸮0 IE
13. ]Q}RTC_RQ⸮U⸮I⸮⸮t:0x3bBSPI_FP*⸮e1M!_BOOTJC!+͡read Y.. ⸮⸮⸮⸮
14. etsՅ⸮⸮⸮⸮71
15. et.Rչ⸮ ⸮⸮016 0⸮22:5⸮C⸮⸮rs⸮⸮x10 ⸮*⸮]Q}ITC_RESQU⸮⸮⸮⸮i0x3b i⸮}MQ_FLAS⸮%==Q⸮
16. flash ⸮V⸮⸮er. ⸮⸮⸮⸮j
17. ets_[XZ⸮i⸮371
18. ets Jun⸮ 2016⸮⸮:22:5SH⸮
19. rs⸮⸮x10 (*⸮]Q}IQ
20. }RESET)I⸮⸮⸮⸮0x&,B⸮A%}⸮ST_FLP*⸮%==Q⸮
21. flash⸮⸮⸮⸮⸮er. ⸮⸮⸮⸮j
22. ets_mXZ⸮i⸮37Lj
23. ⸮ׁJun8 20L⸮⸮Ғ⸮⸮57

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Sometimes its like this

I can upload the program again and its fine, until I send some request to it on wifi.

Any ideas would be great...
Thanks