Hi Mads!
Thank you for your reply. I finally had time to check it out and looks like Colorgenius is not able to fix the problem. It can even out the exposure of brighter and darker areas in a frame but not general exposure changes over a longer sequence of frames. At least that’s how I understood. You helped me to delve in to the problem more seriously though and find the solution that works. That is Davinci Resolve Color stabilizer effect. I didn’t try it out personally, but the youtube tutorials that are out there are exactly fixing the problem. Could not find any alternative for Vegas pro that works the same. Looks like I have to either fix the issue manually, or then go for Resolve, if it’s worth it.