Only thing I can think of from my experience, is that they seem to have two 4wd ‘modes’. Flick the switch and you’re in 4wd but it disengages automatically at hmm, 16 km/h from memory? May be more like 20, haven’t had much call for 4wd recently..
But if you hold the 4wd switch down for 5 seconds or so, it seems to lock in 4wd, and doesn’t disengage automatically at speed.
Probably not related to your issue, but could be worth a try.
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