To get the pump to start I have to hit the rest button on the bottom of control box, the pump will then run as normal fully charging the tank until pressure vale kicks it off, it will run water for quite some time before pressure gets low enough to kick the switch back on but I have to reset the button for it to start again

Check the little pipe leading to the switch to make sure it is not "crudded up". The little lever you are pulling is a safety feature. It turns the switch off if the pressure falls to 10# below the cut in pressure. If your switch is slow cutting back in, it will disable itself and you have to reset it with the lever.