I suggest, you are a paranoic person. Mathematical random still means that it is possible to get a dice roll with 6 up 10 times straigh one after each other. The rolling is then still random, although it seems to be rolled by a cheater.
As it is pretty hard to code a real good (in terms of value gaps beween the roll results) "random" generator, you could go and try to code a more "random" gen yourself, or just let it be as it is, because then it is still "random".
A suggestion: use -> /rnd 1000 or /rnd 5000 That gives you more chance to get a wider value gap between results.