I recently started having disconnects that last up to 1 minute every half-hour or so when playing Blizzard games. During these times, all my devices ; PC, mobile, TV, etc… remain connected but have no Internet access : livebox is fine and shows that the Internet is supposed to be working.
I think the issue is the background process “Blizzard Update Agent (32 bits)”.
Disconnects happen even without any games launched, only if the Windows version of Battle.net is launched, more precisely if the “Blizzard Update Agent (32 bits)” process is running : keeping only “Blizzard Update Agent (32 bits)” while killing any other Battle.net processes still causes disconnects.
At my suprise, killing it prevent all disconnects. I’m a bit surprised that a background process on my PC can crash my entire Internet.
Killing this process every time I open the launcher solves the issue for me, as I didn’t experience any more disconnects. I occasionally check if it still causes problems, and it does still cause disconnects up to this day.