hmm I think I have a similiar problem also with ec1-a, sometimes when i life my mouse it won't move when i put it back down, probably gonna return it and get another one.
learn how to lift from flusha
If you have warranty left just send it back to benq, they'll send you a new one.
Common problem for shitty quality zowie series, id return it if you still have warranty and get Rival 310
When did this problem occur? I've got zowie ec1-a as well and I never had any kind of problems with it, but recent the problem that you mentioned above occured. There are several people having this exact same problem which makes me think that this might be a software issue. There's no way there's that many sensors going to crap at the same time...
mfw i buy a zowie ec1-a and i gotta switch to claw grip because of my comically oversized hands