[CharlesStevenson]

The hazard switch is definitely something that needs a gentle touch - mine jammed once but if you take it out you can reset it so it works again (assuming you've not bust it!).

I don't think it's the internal wiring that plays up, just the quality of the fittings, so if you can get a second-hand from somewhere I'm sure that'd be ok (but try releasing yours if it's jammed first)