basicly title says it all. i have a new ESP eclipse 2, i took it to the store a few time for the mechanic guys to look at the locks etc. i have a set of 0.12-0.56 strings on it, tuned to drop B, and it keeps going out of tune, its the 3rd time i am changing strings on it, so i've tried with old and new strings and everything. the strings are ernie ball not even slinky. the strings (specially the lower) keeps going out of tune, what do you suggest?