Well for what it's worth, a working unit does not need any wiggling to work correctly.
My replacement unit is very sturdy and durable.
Out of curiosity; where was yours purchased from? As far as I know Micca (or Amazon through Micca) is the only authorized seller in the US (if you are in the US of course) and the defect of your E9 could be a result of mishandling by third party sellers.
All I'm saying is don't jump to blame FiiO when there are several hands that your purchase passes through before it reaches you.
If possible I would recommend returning your unit for a full refund and ordering from Micca. Jack will take good care of you. :)