My gr10w bunn coffee maker leaks while using.I think it overflows the filter then leaks down. I use Bunn filters. please help!

If it is leaking out past the filter basket, it can be fron two things- either the basket edges are worn out, and is allowing water to leak past it, or the hole is being partially blocked by scale or caked coffee. in the first case, try replacing the filter basket. In the second case, you can either clean out thr hole or try running a drill bit through it to clear the hole.