Yo my fellow axe-men. I have a question/concern.
Few weeks ago i picked up a second hand acoustic (epiphone hummingbird). This guitar is freaking great. Sounds brilliant with strumming/chords, looks like a dream, all that jazz.
Anyways i have a problem with the B string staying in tune. and sometimes the skinny E too. When i play rhythm it holds its tune pretty good, but when i solo or do any significant bending the b strings goes really flat really quickly.
What really surprises me about this is that my other epiphones stay in tune like a dream. Even the bottom of the line $120 acoustic i have (for which the hummingbird is an upgrade over). AND the hummingbird has grover tuners (which ironically none of my other guitars have). For what it's worth i did restring the guitar right after buying it with pretty pricey light-med Martin strings (and yes i stretch the strings and yes i always tune up)
Any advise? Can it be the strings? can it be the B tuner?
Is there anything i should do myself or should i take it in to get serviced?