Hello aIA,
With regard to this statement:
... While the wallet is blocked, the Blockchain updates well, but when it is unlocked and start the mining PoB it crash imminently. I have to try to reinitialize the Blockchain and synchronize from scratch...
When you say it crashes, do you mean that the application closes, or it freezes and has to be forced to close? I ask because I have issues with the client when I stake with the wallet being very unresponsive most of the time during staking, and this could be exacerbated when using lower power divices such as ARM boards.
Regards