i have a question about the infinium. so far my experience has been a absolute nightmare after waiting 4 weeks for it to arrive, brand new out of the box the machine was shutting off when set to lock position. then it was shipped back to garrett for repairs...got it yesterday after another 4 weeks there! and to make it worse i also bought and paid for a 14/10 mono coil that was suppose to ship back with it, i got a paid receipt for the coil but NO coil in the box..wtf...but anyway my question is (stock dd coil on it) when following the instructions for ground balancing starting with fast...which it calms down after a few minutes...i can the switch to slow...sometimes the threshold will raise up loudly..then calm down after a few minutes...so when i go into lock now it also raises up again loudly...my question is....is this normal??? also i only hunt salt water beaches in nj. also checked frequency which was dead silence so i am assuming this is good...thanks in advance for any help