cuboid and cubis. atomizer low, atomizer short.

[sasha no biceps]

so since june 13 i have a joytech cuboid and cubis with a 0.5 ohm coil. i worked perfectly until today. i turned it on, and it said atomizer low, then i turned it off, took the tank off, took the batteries out, waited for about 2 hours, and then put it back together, and it still didnt work. tried again, now it says atomizer short, or atomizer low. what the s#$@. i took the tank apart, and the coil seemed fine. i have a 510 connection, it isnt too short or anything.
what should i do ?
help me pls.
p.s. i have a spare 0.6 ohm coil and it dosent work as well...