I'm having similar issues with my iPad Pro 2nd gen after installing IOS 17.7.5 Started the day after I insatller the update.
Wi-Fi keeps dropping every 10-20 minutes when streaming TV, issues with loading some apps & Safari can't load websites.
No issues with my iMac (Ventura 13.7.4) my Android phone or my daughter's iPhone. It's just my iPad.
Switching my router on & off, restarting iPad sometimes sorts it out for an evening, sometimes it doesn't.
Sometimes I see an error message 'unable to join the network "my wifi".
Sometimes I see the same message, also says "this network is operating on WiFi channels in use by several other nearby networks. Restarting your wireless router may allow it to automatically choose the best channels to use, & may resolve the problem" So I switch off the router & yes, it works for about 15-25 minutes, then it drops again.
Sometimes I see a message telling me I've put in an incorrect password (it's autosaved, so I haven't) then it briefly reconnects without me entering a different password, then id rops again. Sometimes my settings>WiFi show my WiFi name with a blue tick & the words no internet connection directly below it.
Forgetting the network then re-entering details makes no difference.
Last night I founnd the advicec to turn off Private Address feature - I did this & managed to stream a few hours of uninterrupted TV.
Today, after a few hours of being able to access websites & apps (didn't try streaming TV), it's back to behaving as if it's not connected - can't stream or load certain apps, safari can't access any websites, yet settings>WiFi tell me I'm connected, albeit with a privacy warning. iMac & Android phone are both connecting fine.
No VPN or other security ever installed. It's not in a case. Nothing else is connecting to my WiFi, no smart TV or any other devices, not usually doing anything other than using Safari on my iMac, & my phone is usually asleep.
I'm in an apartment block & Hyperoptic who supply the entire estate have been doing remote updates recently. Hyperoptic are also my ISP, but I can't get hold of an actual person, & their online troubleshooting insist its; a device issue.
Any ideas anyone? Thanks in advance
Possible Fix
Within 15 minutes of posting my question, I finally got to speak to a person at Hyperoptic, who was very helpful.
She suggested splitting my WiFi into 2 separate connections - 2.4 & 5 Ghz. Seems I have a fussy device that doesn't like the combination. Took a few minutes for her to set that up, no need to restart anything at my end.
So I now have 2 available WiFi connections, same password, & although it's early days, this may work. Private address was automatically turned on for both connections. Fingers crossed.