The right indicator on my wife's Astra tends to stick on - by that I mean constantly on without flashing. When you turn the indicator off, it still stays on. The left hand side works fine and will flash even when the right hand side is stuck on.
Also, when you lock the car with the key fob, the right hand indicator will stick on again. It eventually goes out if you hit the dash enough times.
What could this be? I thought about the relay, but then both sides would be affected wouldn't they??