TOTAL cut-off of Internet connection for pretty much EXACTLY 5min immediately after starting a BitTorrent. After 5min: all fine again. No cut-off when using a VPN service.
Windows Network diagnostic reports "computer configured correctly, but DNS server doesn't respond" during this cut-off.
Switching DNS servers in Window's IPv4 and v6 settings to GoogleDNS doesn't help.
Upstream: 53318 Kbps.
Downstream: 51398 Kbps.
Upstream: Burst size: 9600-9981 KB;
Shaping rate: 33861 Kbps.
Downstream: No shaper detected.
Median received rate: 50810 Kbps.