Axminster cs2 lathe cut out issue

hello all and thanks to all that advise me on this issue, at first I thought it was the motor over heating as it would stop under load during facing etc but after running 30mins or so. I`ve since found it to be intermittent and still seems to happen after 30mins of use but seems to restart ok if I turn the speed controller to around 3/4 speed `but` running after first cut out at low speed seems to continue this issue. just to clarify, its not tripping out just stopping rotation so I have to lift the guard or hit the stop button to reset it. thanks in advance all.