I started running into this problem a couple weeks ago, and at least for my machine the fix seems to have been to unbind and re-bind to the AD domain. Upon doing this I noticed that the GID had apparently lost its AD mapping, which was fixed upon re-binding to the domain.
## BEFORE unbind/rebind
$ id
uid=1234567891(sanitized) gid=9876543219 groups=9876543219,12(everyone),62(netaccounts),80(admin),399(com.apple.access_ssh),702(com.apple.sharepoint.group.2),33(_appstore),98(_lpadmin),100(_lpoperator),204(_developer),250(_analyticsusers),395(com.apple.access_ftp),398(com.apple.access_screensharing),400(com.apple.access_remote_ae),701(com.apple.sharepoint.group.1)
## AFTER unbind/rebind
$ id
uid=1234567891(sanitized) gid=9876543219(DOMAINNAME\Domain Users) groups=9876543219(DOMAINNAME\Domain Users),12(everyone),62(netaccounts),80(admin),399(com.apple.access_ssh),2128931439(DOMAINNAME\SomeUserGroup),702(com.apple.sharepoint.group.2),33(_appstore),98(_lpadmin),100(_lpoperator),204(_developer),250(_analyticsusers),395(com.apple.access_ftp),398(com.apple.access_screensharing),400(com.apple.access_remote_ae),701(com.apple.sharepoint.group.1),166283020(DOMAINNAME\All Domain Users)