ESP-03 dies after AT+RST but works well anyway

[Pelican]

I've found another issue:
One of my ESP-03 module had a problem with reseting (AT+RST).
It writes the usual information ending with 'jump to run user1 @ 1000', stops there and never give back 'ready' it stays completely frozen. I have to power of and on again to wake it up. Without AT+RST it worked fine.
It had an AT 0.25 firmware so I gave it a try and refreshed it to the 1.0.0 version with the same procedure and it kept this weird behavior: It dies after AT+RST but works well anyway. I'm using it in STA mode, can connect to an AP, send and receive TCP data with no problem.
Any clue?
Can I do something with the Flash download tool to erase it completely?

[ESP_Faye]

Hi,

It writes the usual information ending with 'jump to run user1 @ 1000', stops there and never give back 'ready' it stays completely frozen.

At this time, if just input "AT" through UART, can you get any response?