I have been trying to solve this issue for awhile myself now, which recently became a major headache, as I lost all internet connectivity through wifi as many have explained above. iPhone 12pro running 15.1 shows connected to network, but also says no internet connection. Other devices connected are working fine, but phone is intermittent (very generous description). It also appears my 5G is being impacted when I disable wifi ( most of last week). I have worked with Apple support online and in store for 20+ hours as well as Xfinity in an effort to try and isolate the problem and come up with a solution ( I had not seen this thread unfortunately and was working as though I was the first person dealing with an isolated problem). I was told by tech in Apple store that there was a known bug involving data corruption that caused the issue, so we rebuilt my backup and wiped the phone and started fresh. It didn't work. I have also done a factory refresh clean install and leave all apps and data off the phone, but it still didn't work. I then replaced the phone and restored to backup done shortly before I wiped the phone and it worked for several hours and then failed again. Clearly this is a known issue that has been going on for at least a year now and based on the number of folks following this (ones that happened upon it like me - at least 57k ) it is not an isolated event impacting a few folks. This is something Apple need to address! I have a lot of hours invested in this and the impact this is having on me is real. If it cannot be fixed, let us know so we can adapt/change phones, platforms, software ... I am curious if anyone using the new 13pro is having this issue??