If the ignition coils are not tightly seated on the spark plugs it will result in high electrical resistance in the secondary side of the ignition system (due to the spark having to jump 2 gaps: coil to plug, and then across the spark plug gap as well). This increase in resistance forces the coil to generate a higher than normal seondary voltage; in turn, this can result in coil overheating and degradation of the varnish insulation used internally between the primary and secondary windings of the coil core. If the internal insulation breaks down, it will result in shorted internal windings (a failed coil).
Another possibility is that incorrect spark plugs may have been installed. This engine requires platinum electrode plugs (as do all direst ignition systems that I have ever seen). installation of conventional spark plugs can cause coil damage for the same reasons as mentioned above.
So, the answer is yes; it may possibly be related to the recent service. I would suggest checking the plugs to make sure they are the correct part number andd type, and making sure the coils are all seated properly.
I hope this is helpful; if so, an accept would be most appreciated! thanks!
