Qbitorrent breaks wifi connection

everything is very good but qbittorrent. it works for a few sec then wifi connection break down!
to fix I turn wifi off and back on
turned off upnp in qbitorrent but does not fix problem.
this work fine with old netgear. using 100mb connection.

2.4 or 5? How it breaks down? Your device can’t connect anywhere else? Does it loose link? Other devices works fine? Anything in the logs on the router?