Ms391 ignition module problems

[Paulwil]

Last year I purchased a Stihl ms391, it was a year old when I bought it and the guy said it had recently had the ignition module replaced a few months earlier. About five months after I bought it it started to run rough then it quit, on inspection there was no spark being generated so I fitted a new original stihl module and it ran fine again until today, the same has happened again. I am pulling my hair out with frustration, why is this machine eating ignition modules?, any help would be greatly appreciated, Paul.