Hey there i use a Epi LP standard and i have a problem with my D string. After a each practice session i have that lasts about and hour or more, it notably goes out of tune. Is there something that's going on that i do not know about or is this normal.
* i haven't changed my strings for about 4 months. Butt all my other strings are fine
* i haven't changed my strings for about 4 months. Butt all my other strings are fine