So I've had my AT Pro for a few years now and its just recently been acting weird. Its been IDing targets with higher numerical signals lately. Pennies used to be 79 now they're 83. Dimes were 83 now they're 86-87s and quarters used to be in the high 80s and now they come up in the low 90s. Anybody else have similar issues or know how to fix it? I've already tried ground balancing and playing with the sensitivity. Its been like this the last couple weeks. Its not a big deal if it can't be fixed, ill just get used to the new signals.