Vauxhall Vivaro indicator/hazard lights not working

Hazard lights gradually stopped working then indicators failed. Changed hazard light switch/sensor. Worked after fitting twice. Came out next morning and no longer working having been working previous evening. Disconnected hazard light switch, during the night the hazard lights came on even though switch was disconnected. Replaced switch to turn them off, tested indicators and were working. By the next morning when I started it, no indicators/hazards again!