There is an alternative dll available that might solve your issues. If v2 works for you (which would be strange, because v2 and v3 are identical except for the link), then just use v2 with the new stations.
You can update the stations yourself by replacing the web folder with the one online.
I don't know what causes the crashing. I assume you already made sure your drivers etc. are up to date, especially graphics drivers.
The sudden switching sounds like you have a hotkey for switching to the next station that you assigned to a key/button you also assigned in the game.
So e.g. if H is both your next station button and horn, for example.
Then we can look at solving the radio station changing constantly.
I have not heard this before, so check the things mentioned above.
I can look at it when I have time (and feel like it), but don't expect that to be soon (months rather than days).
This might sound harsh, but I have a lot of things I want to do at the moment, and ETS2 Local Radio is not one of them.
Let alone track some bug that I cannot reproduce and seems to only affect one person so far. It's nothing personal.
If you can point at something that is going wrong specifically (finding out the exact conditions of what causes it to crash), but that will require a lot of effort and time.
I cannot give you a tutorial on how to do it, because if I could give you that, then I could probably solve it too
One important aspect of v3 is that others can update the stations at a rapid pace, without my involvement.
So no, I don't have any update, and I wouldn't expect one anytime soon.