I have way over 150 hours with mine in soil and freshwater beaches, and I am usually pretty positive with my posts, but in the case with this one the best advice I can give is upgrade to almost ANYTHING else as soon as possible!
Using this particular detector is not going to be the same satisfying, non frustrating experience you will have with most other units on the market.
Don't think it is, and don't let it annoy you right out of the hobby.