If you mostly receive blue health smileys, you might suspect that to be the reason. Use IP geolocation database by DB-IP instead of MaxMind. However, perhaps with the specific VPN provider I use, have found one possible issue / vulnerability… If the VPN does not fully disconnect, but it “times out” (in that limbo state similar to when first establishing a connection but before getting an IP address), qbittorrent still seems to be “uploading” (i. Version history for qBittorrent forwarded port and added it there.
When you enable the IP filter in µTorrent (the version I am using has this enabled by default), the bittorrent client reads a file called ipfilter. Now I received some of the e-mails from readynas that blocked before.