JVC camcorder

I have two JVC camcorders. They worked fine for a while now neither will focus past about forty yards when zoomed in. I sent them both back to JVC two years ago because they said they needed a software upgrade. I paid $90 to have that done. One worked for a few months and the other stopped focusing six months ago. I can use them if I don't zoom in very far. Anyone have this problem? Thanks, Scott