What has been happening is the pumps come loose so they are not attached, this would generally be fairly obvious from it clanking around inside when you move it. They added an extra brace in the last week or two so it should be resolved now but usually if it was loose you just needed to clip it back in, however sometimes it really beat up the innards and some parts needed replacing. The bubbles within reason would be normal for the first couple weeks. Adjusting the depth (raising it) and opening the air both help.