This seems to have been an ongoing problem for a long time. I've had one Sonnet over the years - nice pen to look at, but prone to drying out and a problematic starter when it wasn't dry. Couldn't get rid of it fast enough.
I really do fail to see why some people have such a fascination with what appears to be a poorly designed and engineered pen.
The feel of the pen, the looks of it, the investment you might have already made by the time you realize there is a problem with the Sonnet. Those things keep some people involved with Sonnet. There is also the variety of nibs available and the ease of changing nibs.