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I withdraw th question. SInce 4.3.3 I no longer have this problem.

Before I forget, I am using:
Windows 10
Qbittorrent 4.3.2
Technicolor 7200 modem/wifi router (but using it via ethernet)
network DOCSIS 3.0 - 25 up/250 down

My qbittorrent takes the whole network down (I can no longer netflix or even browse webpages anymore) One cause may be that I have too many open connections. Research pointed out to me that I can control the amount of open connections in qbittorrent by decreasing the numbers in the options/connectio...

I screwed up a little in removing all tags, then stopping qbittorrent and then recreating the tags. somehow the count of untagged torrents got screwed up. it is now greater than zero, but all torrents are tagged. How can I fix this?

since version 4.2.3 works, i consider this request closed

It seems I am the only one with this problem?

I always sort my torrents on date completed (reversed) that way oldest is below, newest is above

the process is "not responding" and the cpu usage is very high (both informations from the task manager) I have also looked at it with the process explorer (sysinternals) and saw that qbittorrent sends a lot of SYN_SENT events, there is not an ESTABLISHED event after that... indeed at that...