Sorry if this sounds a little simple but sometimes it is the little thing, we had the same thing with a 60 we were playing off road with a few years ago and it was one of the freewheel hub lock had not locked in so after a little fiddling with it all was ok.
check the RS motor mount. when the motor surges it twists, if the mount is weak or torn it will cause the linkage to yank it out of 4wd. fix mount, adj linkage
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