Quarry not digging down anymore?

[DakuFaita]

The quarry I built was working fine for a while. Then, I checked on it and it has stopped working. Well, the quarry appears to not be able to reach any of the blocks below anymore. Is there a limit to how low the quarry digs?

 

[dylanpiera]

it probbably hit lava

 

[DakuFaita]

it probbably hit lava

No, i can see it and it certainly hasn't hit any lava.

 

[Xavier Clinquart]

Lets start with the basic question what quarry is it?

 

[dylanpiera]

Lets start with the basic question what quarry is it?

xD, I hoped it was the most obvious answer
edit: Maybe some pics?

 

[Jackcat136]

Power Shortage? Item Overflow?

 

[TheDarkElf]

Maybe the power is not enough.