Is anyone having problems with 4 high lock ?

[blackh3]

the manual says to try reverse for 25 ft to disengage 4 high and that only worked one time,
the second time I had to put it in 4 low and from there awd worked but I also got a service 4wd message. The dealer said I'm not the first to call with this problem and The 4wd high worked fine for the first few snow storms that we had.