I had this issue previously on my pi 4:
Raspberry pi 4b: failed to connect to network
which I thought I resolved using a workaround BUT
Recently when I used my pi for ~1hr ( with network connected through wifi ) than I rebooted it the connection dropped!! I rebooted multiple time but connection failed!
I bought my pi ~1 month ago from official vendor. I have only browsed youtube on my pi until now.
Here's my main issue right now:
Now I have to keep my wifi adapter connected to my pi always for network. If I boot pi without adapter it won't connect to wifi. with adapter too it takes 5 min after boot to connect to network. And after using it for more than 20 min and than rebooting will disconnect the network than. In order to get it back running I have to shut it down and wait for 10 - 15 min before booting it back.
I need to know asap weather my pi is defected so that I can replace it or file a complaint regarding the same.