For people who knows and climbs earth tower these bugs are no surprise but I don’t think anyone has yet posted about them.
First of all first floor or other floors where you have to kill a set number of mobs, sometimes they get stuck and don’t really move, this affects the rate of mobs appearing and the time of clearing waves.
Another bug happens on floors 4-9-14 etc etc, basically what happens is that you get all the energy that the floors need 200+ and then for some random reason the energy starts to get substracted and sometimes you fail the floor because of this bug as well. You can think this happens because you get hit by mob around but it just happens randomly without getting hit.
Please address this issues because these random bugs and errors just slow you down in getting high end gear, specially from ET.