But if it is a dry joint on the pins in the transmitter, pushing the module around will deflect the pins slightly and will most likely make a connection. It's certainly worth a look if you are happy A) taking your transmitter apart. B) competent / confident enough with a soldering iron just to touch on the joints to re-make them. As a dry joint isn't necessarily obvious.
It's worth a go..
Your 40mhz module could be very slightly offset and therefore not displaying the same problem. It may also only be a momentary break which may not be as noticeable on 40mhz, but 2.4 will take its time to re-bind etc.
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