only just this morning, the bore goes on at 5am as normal but shuts down after 10secs then goes on after 30secs then off again then on again, I turned the unit off , first time this has happened, anybody know why this has happened,thanks

Faulty 3 phase switch or pump on the way out probably . I had my switch fail about 3 yrs ago was doing similar things was about 200 bucks to get an electrician to fault find and replace the switch.