I have no idea what past years are, but it just looks like to me that virtually everyone is terrible on the road. In the East only the Bucks, Raptors, Pacers, and Sixers are above .500 and no one is at .500 (the C's are 6th best as the Heat are 1 win better than the C's on the road). Maybe that is just an East thing, nope. Out West only the Warriors, Thunder, and Clippers are above .500 while the Nuggets and Rockets are exactly .500. There are still 11 teams that haven't yet lost 10 home games (those 11 all have at least 22 wins so a huge win percentage). The Spurs have the largest discrepancy as they are 25-7 at home and 11-22 on the road. In addition, 4 other teams have at least 10 home losses but all have at least 10 more home wins then home losses (C's, Jazz, Timberwolves, and Mavericks). So half the league is at least 10 wins better at home (I realize that is 5 games switched but that is a lot). The Heat, Bulls, and Knicks are the only 3 teams that have been better on the road than at home and they are obviously very close to that not being the case.
Again I haven't looked at years past, but that seems like some pretty crazy splits. So it appears that the C's road troubles are just the normal thing this year.