My network card is an Intel(R) Wi-Fi 6 AX201 160MHz and I'm running on a Fujitsu U7310.
I had two issues:
Issue 1: having to connect manually every time I start the PC.
Issue 2: constant disconnects and having to manually reconnect.
After updating to Windows 11 I lost wi-fi connection once every 5 to 30 minutes and had to manually reconnect every time.
What fixed the constant disconnecting (issue 2) for me was downgrading the network card driver to an older version. Previously I had driver version 22.90.0.5 from 27.09.2021 (I tried installing a newer one that was posted here, but it didn't take - might give it another try later on), but after downgrading to driver version 21.60.0.5 dated 11.11.2019 I haven't lost connection again. However, I still have to connect manually after turning the PC on, so there are still some kinks to work out.
The proposed fix by Ackphfft didn't work for me - for either driver version. I didn't test if it affected the constant disconnects on the newer version, but neither versions connected automatically when I started the PC after holding the off-button for a whole minute.
So issue 1 remains unfixed for the time being, but I'll be back if I find a solution.
TL;DR: downgrade the network driver version if you keep disconnecting.