I've had an Automate for a little over a year and haven't had to do anything to it. However, when I first bought it (new but from a reseller), many of the components inside were loose and needed tightening. I added the foot control switch (not a MEC option) and it's been smooth sailing since.
I don’t have a huge number of rounds thru mine - I think I did have to replace an inline fuse at one point. Quite frankly, if something went wrong with the electronics I’d probably be out of luck as I no skills for those things.
I have well about 100,000 rounds on my automate. Other that blowing the inline fuse one time during a collision it has not required anything.