I have a large Gmail inbox with about 260,000 messages collected over many years. After setting up the account as IMAP it took several days to download the full messages ("Syncing"). However, even after the syncing of all 260,000 has completed, I get a message in the Status bar that messages are downloading again; e.g Downloading message xx of 40,707 in Inbox... After done, and a few hours later, it start gain, now Downloading message xx of 7,149 in Inbox... This keeps going on during the day with different remaining numbers in the inbox (increasing and increasing numbers). I am not sure what triggers the download. Maybe when I look at another Inbox and then return to this Gmail inbox(?) How can I troubleshoot this? Is there some way to find which messages are downloading? I am assuming that the same messages are downloading multiple times (I am receiving less that 50 messages/day). I am using Betterbird 115.14.0-bb31 (64-bit) on Windows 7. When the messages are downloading the CPU goes very high and the program (and PC ) become unresponsive.