occasional air bubble in toilet

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A partial blockage of the sewer pipe could cause this. A partial blockage from roots could come and go if something occasionally gets hung up on the roots.
Is there anything else happening in the house when this occurs, such as a toilet in an above floor being flushed or a washing machine or dishwasher draining? Even a shower could cause this to happen if the water drains too fast.
If there is a partial blockage, the slug of water rushing through the pipe from another toilet flushing or washer draining will hit the blockage, bounce back and push air back into the system. This air will find the easiest way out and that could be the gurgling toilet. You don't get any water backed up because the blockage isn't big enough to fill the drain.
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ben wrote:

your plumbing. That would be gas bubbles from the sewer or septic system that are bringing that gas into the house. Not a good thing.
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