Dear all,
I have got exactly the same problem on two totally different computers, both running Lubuntu 20.04. I have found this bug report as one of the very few search results for the obviously very rare error message: *wlp1s0: disassociated from xx:xx:xx:xx:xx:xx (Reason: 33=DISASSOC_QAP_NO_BANDWIDTH)* journalctl -f shows this immediately as soon as the wifi connection gets lost. In my case the problem came with an update to kernel 5.4.0-58. Going back to 5.4.0-56 or 5.4.0-54 resolves the issue. I have a similarity to Jürgen: I am also running a Fritzbox with a repeater - in my case in a Mesh environment, so everything (router, repeater, 2.4GHz, 5GHz) has the same SSID. I hope this helps to narrow down that issue. Rgs, Martin
