4a4 wont stay engaged on 1996 Ford Explorer

when i turn the switch from 2 wheel drive to 4 auto it engages for about 1 minute then both the 4 hi and 4 low lights flash 3 times and its in 2 wheel drive

Asked by for the 1996 Ford Explorer
2 answers
possible actuator issue.
have codes scanned and post so we can adv