thanks for your help, but this has not worked. I tried to decode the stack trace and got this…

0x40106b58: interrupt_handler at /home/phil/.arduino15/packages/esp8266/hardware/esp8266/2.3.0/cores/esp8266/core_esp8266_wiring_digital.c line 119 0x40106b20: interrupt_handler at /home/phil/.arduino15/packages/esp8266/hardware/esp8266/2.3.0/cores/esp8266/core_esp8266_wiring_digital.c line 113 0x40202e94: handleInterrupt() at /home/phil/Arduino/libraries/RFControl-63007cbf263de5ed361834d6dddeafbe488f61bb/RFControl.cpp line 296 0x40106bbc: interrupt_handler at /home/phil/.arduino15/packages/esp8266/hardware/esp8266/2.3.0/cores/esp8266/core_esp8266_wiring_digital.c line 135 0x40106ba6: interrupt_handler at /home/phil/.arduino15/packages/esp8266/hardware/esp8266/2.3.0/cores/esp8266/core_esp8266_wiring_digital.c line 131 0x40100720: cont_ret at /home/phil/.arduino15/packages/esp8266/hardware/esp8266/2.3.0/cores/esp8266/cont.S line 118 0x40105101: ets_timer_disarm at ?? line ? 0x40106b20: interrupt_handler at /home/phil/.arduino15/packages/esp8266/hardware/esp8266/2.3.0/cores/esp8266/core_esp8266_wiring_digital.c line 113 0x40105666: spi_flash_read at ?? line ? 0x40106ff8: pvPortZalloc at /home/phil/.arduino15/packages/esp8266/hardware/esp8266/2.3.0/cores/esp8266/heap.c line 33 0x4020817d: pm_set_sleep_time at ?? line ? 0x40208612: pm_get_sleep_type at ?? line ? 0x402086bf: pm_get_sleep_type at ?? line ? 0x40201018: delay_end at /home/phil/.arduino15/packages/esp8266/hardware/esp8266/2.3.0/cores/esp8266/core_esp8266_wiring.c line 40 0x40219da1: ets_timer_handler_isr at ?? line ? 0x40219de6: ets_timer_handler_isr at ?? line ? 0x402037ef: loop_task at /home/phil/.arduino15/packages/esp8266/hardware/esp8266/2.3.0/cores/esp8266/core_esp8266_main.cpp line 56

I thought this would point me to a line in the sketch that was causing the crash but all the errors point to local files on my pc.

Any help is appreciated