Bubbles restart after 1 month?

i've done 4 batches one month ago, one per day, day after day.

My batches now are of 60L, and I use 2 30L fermenters for each batch. 2 of the 4 batches are the "same recipe", so I have 4 fermenters in "same conditions".

So, bubbles stopped a long ago, there's no activity on any fermenter, beside 1 of them.

What could be happening to it to restart to bubble? It can be a sign of too much time in primary? Never take so much time in primary, always bottled after 1 or 2 weeks, but reading here make me feel encouraged to spend more time. I live in Brasil, my room temp is sigthly higher than the optimal.

Thanks in advice.

Topic bubble airlock primary homebrew

Category Mac

1
answered at

You can always open the lid and carefully take a quick look to see how it's going. Usually the sings of infection are bad smell and white mold spots on the surface. If you don't notice any of that you're good, you can also take a gravity test to see how the yeast is doing and compare it to the other batches...

1
answered at

It got warm, so the pressure inside the fermentor increased, forcing gas out through the airlock, which you notice as bubbles.

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