ESP-PROG : Hash of data verified missing

[frenchf1]

After writing FLASH sometimes the line "Has of data verified." is missing (not reported) ?

What could be the root cause of this unstable behaviour ?

Erasing flash...
Took 0.08s to erase flash block
Writing at 0x0001d000... (12 %)
Writing at 0x0001d400... (25 %)
Writing at 0x0001d800... (37 %)
Writing at 0x0001dc00... (50 %)
Writing at 0x0001e000... (62 %)
Writing at 0x0001e400... (75 %)
Writing at 0x0001e800... (87 %)
Writing at 0x0001ec00... (100 %)
Wrote 8192 bytes at 0x0001d000 in 0.3 seconds (262.1 kbit/s)...
Hash of data verified.