Rickenbacker neck isn’t staying adjusted.

Hello everyone, I had a luthier in my town adjust my 1973 Rickenbacker 4001, since the action was out of whack and it needed a neck adjustment. Well, I got it back and initially it was fine, but has reverted back to being terrible to play. I tried adjusting the bridge, but to no avail. It buzzes at the low end and is painful to play at the top. The neck is still bowing.