Its just what happens to vehicles with significant miles on them plus additional battery loads, etc. I'm over 150k on mine and in addition to mechanical age, the long term weak points of modifications can show up too.
I know. I'm no stranger to dealing with crap in older vehicles. At least all of the stuff I've been dealing with this year have luckily been somewhat minor (except maybe the AC). For now.
My wife is ready for a newer one, but I think this one still has some good miles ahead of it, so I don't want to get rid of it. Just need to keep on tackling the things as they appear, however frustrating they can be one after another...