Sanwa Exzes X issue

[h0m3sy]

I bought one of these transmitters less than a month ago, I have used it twice in that time for around 1.5-2hrs. Yesterday at the racing, the steering stick just went all loose, it wouldn't return to the centre. The steering still works but as you can imagine, it is nigh on impossible to control. The transmitter has not been knocked or dropped and is always kept in the box. Has anyone else suffered a similar issue?