The Savannah appears to be quite a robust little machine with a low level of known problems - unlike Jabs. I can find no AD's or SB's that indicate any indications of design problems found in the Savannah.
One Savannah (model VG) crashed near Mt Magnet aerodrome, Western Australia, and the cryptic description for the reason for this crash, is given as "mechanical - flight controls".
The description states a rudder control problem that occurred at cruise at 3000' led to the crash upon landing. No-one was injured in this crash, despite the aircraft inverting upon landing.
https://www.google.com.au/url?sa=t&r...NZ20ltGqJfChfg
A few Savannahs have crashed due to powerline strikes, and a couple in the U.S. seem to have undetermined reasons for the crashes, although the pilots were aged 69 and 82.
The only AD relates to a Savannah crash in Norway, where the cause was attributed to wing strut attachment plate failure due to corrosion, due to extended outdoors storage. The advice is to merely to inspect the plate for corrosion or cracking.
Paul Alfred indicates this Savannah was only 2 yrs old, it doesn't seem like age or hours could present as a problem here.
However, I guess there's always the potential for an assembly fault that wasn't picked up, that has led to a control continuity problem.