1998 Jeep Wrangler Sahara

I purchased my Jeep new in 1998 and have had very few mechanical problems, with one major exception.
When the Jeep was about 5 years old the coil broke, (the electrical one, not the springs) Since then I've had to replace it at least 5 times, maybe 6. (Twice in the past 10 months)
No one has an explanation, do you?
It's bloody inconvenient.