Lost Position Mid Routine

I have had my machine for a while and would consider myself competent. I use VCarve Pro to create my G-Code so I am reasonably confident this is correct. I have recently had failures while routing and on my latest piece, I have had three different issues on the same piece.

1) While carrying out a pocket toolpath halfway through the first cut the machine stopped. I was not looking at the machine or the screen as it happened but when I did all the axes were not homed. I assumed a power failure and tried to resume but this did not work and I had to restart.

2) During the 2nd attempt the Z axis did not fully retract on a move and so cut through part of the job. I was monitoring this time and managed to stop using the E-Stop.

3) On my next attempt I was monitoring and heard a crunching noise as if the machine had hit something. (It hadn't) the router was then out of position and once again cut in the wrong place. This time I also got the error 'over temperature shutdown reported by driver(s) 3'

I have checked back in the console log and I only received the temperature error once.

I have no idea where to start any assistance is appreciated.