I had/have a nitro v as well.  Traxxas servos are supper crapy when they get wet, and in those old boats they got wet.  They tend to have a mind of their own.  You can attempt to open and clean them, but once they have glitches like that, it doesn't take much moisture for them to glitch again.  I would replace the glitching servos in the V.<div>
</div><div>As for the SV 27, I don't know, but it sounds like the rx is shot.</div>