Gap between backsplash and wall changes with season
I have an interesting problem where a large gap( nearly a quarter inch at the largest point) appeared between the backsplash of a kitchen counter and the wall, which is along an exterior wall. It appears to have been caulked before but has pulled away and opened. The house is 6 years old and I bought it about 16 months ago. The gap appeared last winter and then closed up in the summer but opened back up this winter. I suspect it is the wall "flexing" with the temperature because there are a few places where things on walls have shifted, like trim or small cracks in the drywall corners. I just fixed a bad corner that was either truss uplift or just bad drywall, not sure though.
Anyone seen this before and have any ideas of how to fix? I could caulk now while the gap is open, but I'm concerned about what may happen when it tries to close.