We are having the same problems here in Akron Ohio (LCMS). My husband got in an argument at a council meeting, because no one ever checks into the reasons members are leaving. The Mo. Synod is forcing churches to move to the left. new hymnals that water down our doctrine. Words are changed for no reason. I have an idea many are leaving because of the modern ideology and contemporary hymns and services.
I always thought LCMS was special in it’s doctrine and hymns—as opposed to Protestant Churches. Members are not happy with these changes—synod thinks they will get more members-—WRONG. We were raised to believe in strict doctrine—now we wonder why we even bother to attend.
Well if the doctrines are the chief reason, you’re going to get disappointed. Most important is to have the Christ that the doctrines are intended to describe. You don’t get Christ by making a web of doctrines and waving it in the air. Once you DO have Christ, then getting the doctrines as correct as you can makes sense.
I don't know which "new hymnal" you're referring to. But in my opinion, as a conservative, confessional LCMS pastor, Lutheran Service Book (LSB, 2006) is the best hymnal we've had, and I grew up with TLH (1941) and have used LW (1982). LSB has way more good hymns to choose from, sound theologically and good musically, than we've ever had in English before.
Now I don't know how the hymns or liturgies are being chosen or introduced at your congregation, but that can make a difference in the way the hymnal is received. Most of the reports I hear from around the Synod is that LSB has been very well received, far better than how LW was received. LSB was well received at my parish, and we were old-line TLH.
Now when it comes to so-called "contemporary services," that's a different matter. By and large I think they stink.