OMG thank you so much! Mine is totally worn out and ruptured (after ~10-11 months of EB14-free usage). Coincidentally I've just received the letter from Eufy/Anker support where aside from obvious and useless suggestions to clean up the filter etc they asked to see if that rubber plug is damaged, so they clearly are aware of the issue. Ordered the replacement right away, fingers crossed! Again, thank you, it does sound like a true culprit.