I'd note, too, that of their 8 road losses, 4 have been at GST, CLE, OKC, and TOR, which are a combined 81-14 (.853) at home this season. So, it's not like they've been piling up road losses in buildings where road teams win frequently. It seems worse, because they've been beaten badly in their last two road games; of course, those two games happened in places where the home teams are a combined 41-3 this season, so losses there aren't unexpected (though the margins were disheartening).
I did a bit more digging on this, since some pundits were trying to make something of the fact that the Spurs are "only" 4-5 on the road against teams that are over .500.
4-5 (.444) is actually the fourth best winning percentage on the road against .500 teams -- it was 3rd until Cleveland won in overtime last night in Indiana. For the record, there are only 2 teams that are over .500 on the road against teams that are over .500: Golden State (7-2) and Toronto (6-5). Cleveland is now 5-6 and then the Spurs are 4-5. Nobody else is even within a game of .500 in that spot.
Code:
Road vs. .500+
W L GP
0.778 gst 7 2 9
0.545 tor 6 5 11
0.455 cle 5 6 11
0.444 sa 4 5 9
0.429 was 6 8 14
0.375 okc 3 5 8
0.364 atl 4 7 11
0.364 det 4 7 11
0.333 chi 4 8 12
0.333 lac 3 6 9
0.333 sac 4 8 12
0.308 ny 4 9 13
0.300 hou 3 7 10
0.273 uth 3 8 11
0.273 cha 3 8 11
0.273 bos 3 8 11
0.273 min 3 8 11
0.231 ind 3 10 13
0.222 mem 2 7 9
0.200 brk 3 12 15
0.182 mia 2 9 11
0.154 dal 2 11 13
0.143 mil 2 12 14
0.133 pnx 2 13 15
0.091 no 1 10 11
0.083 den 1 11 12
0.083 lal 1 11 12
0.000 prt 0 7 7
0.000 orl 0 10 10
0.000 phi 0 13 13