Weird overcharging issue

Hey all, I have suspected my regulator box is bad but I wanted to get some opinions before I start buying things. About a month ago my car started acting funny.....every couple cold starts (not every time) my voltage gauge would read excessive charging and then after a bit would go to normal. Twice now in this past month I have been driving and randomly my radio fuse blows due to a excessive charge spike. The alternator is less than a year old but I haven't really touched any of the other components because why replace what isn't broken, right? Since this is a recent issue I suspect something is just wearing out. It only spikes when the RPMs are increased as well, at idle it isn't really noticeable.