First of all make sure you have full GP before starting it up, and if still no go simply drop down the control menu and reload minion. this in my experience has been getting it to work rather then having to restart the whole game/PC.
Edit: Not 100% sure where the problem lies but i'm starting to think it's related to minion bugging out on one node when you start it and you don't have enough GP for the node that it starts on. this is just me guessing but every time i wait till i have full GP and reload the bot from the control menu it seems to work fine from that point, until i sometimes bug it out again by manually interrupting it and going to like the collectible trade NPC and re-enabling it without full GP or switching jobs to check something and then switch back to a gathering job outside a sanctuary.
Edit: Not 100% sure where the problem lies but i'm starting to think it's related to minion bugging out on one node when you start it and you don't have enough GP for the node that it starts on. this is just me guessing but every time i wait till i have full GP and reload the bot from the control menu it seems to work fine from that point, until i sometimes bug it out again by manually interrupting it and going to like the collectible trade NPC and re-enabling it without full GP or switching jobs to check something and then switch back to a gathering job outside a sanctuary.