Hi Frank!
I had a similar issue with my Fairphone 6 (murena edition). Connection was really slow on my home wifi network, with many timeouts. My laptop and other phones work flawless.
I read somewhere a user mentioned that the Fairphone don’t like high channels. I changed my operating frequency to 5180 MHz (channel 36) for my wifi. Please try!
Another related topic is Really slow wifi but fast mobile data - #8 by Symtux .
I hope any of these changes can make it work for you, since it was really annoying with these timeouts.