Ugh, same! My $30 Moleskine bleed worse than a cheapo one.

A corroded pin on the standby umbilical, man that stings. Three days of tearing apart headsets and comms boxes just to find one green pin hiding in plain sight. I feel your pain on that one. We chased an intercom gremlin for two whole days once and it turned out to be a tiny crack in the wire right where it bent at the connector. Drove us nuts because it only showed up when the diver turned his head a certain way. You start second guessing everything and swapping parts that were never the problem.

Airflow in a house is one big loop, so pulling air in one spot and pushing it out another can cancel itself out without you even noticing. Bet a lot of people blame the cooler for being weak when it's really just the fan stealing its pressure. Worth checking which way your doors swing too, since a closed bedroom door can mess with the whole path.