Just chiming in on this matter, as @Bongsmoker89 stated in his post the best course of action is to not move your roots around if you don’t need to. The roots do not affect sensor readings or the dosing portions of the Grobo One.
If you absolutely have to look at your roots please use the utmost amount of caution when moving your lid. I would recommend lifting it straight up very slowly and, if you notice any resistance, stop and try to dislodge the roots from what they’re stuck on. When the plants get that big it’s equivalently not good for the top portion of the plant as you’d be knocking it around the inside of the Grobo One