Its just straight resist checks.
If you tash/malo the mob it will stay rooted much longer. For most blue mobs you can expect the root spell to last the entire duration at higher levels.
I rarely see a blue mob break paralyzing earth (3 min root) unless I nuke it. For harder mobs frequently tash/malo makes it last the full duration.
I do think that there is actually something screwy about how root break checks work on p99, but I don't think thats what you are describing. Sounds like you are just low lvl and trying to get root to stick on even cons or high mr mobs.
The only thing I will actually consider is that waaay back they did adjust the root resist checks (several years ago). I don't think that I've played a low lvl caster since they made those changes...it is possible that the resist checks at low lvl need tweaking. Again, all things above considered, it may just be your lvl and choice of mobs.
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