I'm going on my second replacement in under 6 months with LED bulbs. I really don't know what is going on but I really love the brightness of these ligths. I've already contacted Xtralight 2 times and they have also send me replacement.
I was fully informed before buying these bulbs that they do not last as long as a standard bulb because of the material they use to create the brighter light. So, keep that in mind when buying these LED bulbs. But I was expecting at least close to a year with each bulb, not 4 - 5 months.
I'm checking with a local mechanic as well. Issue could be in my car as well.