@t3p3tony I have solved it 
Was kind of my fault. When I originally setup the printer it had no heated bed as a wire was broken. When I recommissioned the bed I activated it in the firmware but forgot all about setting a PWM frequency for the SSR. After experiencing the issue with the printer hanging up multiple times I went totally through the whole power supply chain and replaced everything with components I 100% knew to be working.
After this didn’t work I racked my brain and remembered there was a SSR being controlled with a PWM signal. As soon as I put in a frequency parameter of 10hz the issue went away. The printer has now completed 3 x 24 to 30 hour prints.
My guess is the default PWM frequency was causing the SSR to leak or feedback power which effected the reliability of the board and made it reset after a few hours. I am not an electronic engineer by any standard so this is just an assumption.
Thank you for your help. Hopefully if anyone else experiences a similar issue this information might come in handy and allow them to resolve the problem.
All the best