Jim Hill
Mr16 lights aren’t the easiest to put LED bulbs in. The lights almost certainly have a transformer to give them the extra low voltage power that they need and these transformers are designed for halogen bulbs rather than being specific LED drivers so this could be the problem. Also, the bulb holders themselves can fail but these only cost a little to replace. If I had to put money on it I would go for the transformer being the advice would be to change the light fitting for a good quality sealed LED fitting, IP65 rated, such as the enlite E5 or the E8.
