I changed five MR16 Halogen lights for a customer in March to LED. Used Ledhut Fire Rated GU10 with 5.8W lamps. About a month ago three of the lamps were not very bright and one stopped working. I told Ledhut who sent replacements (the offer a five year guarantee) and I replaced them. Now the same problem is back. Asked Ledhut for advice but none forthcoming. Lamps are outside under deep eaves. The originals MR16's worked for 20 years with no problems. Any suggestions?