today the issue again. Strange it worked with no issue for almost 2 monthes and now twice in three days with the same firmware

I also had the problem this morning that the camera suddenly had no network.
I am still looking for the exact cause, but I was able to solve the problem by giving the camera a reserved IP (a different one than before) on the DHCP server.

The camera was immediately accessible via the new IP (the app recognizes the IP change automatically)

  @Richie0414 after all, tplkink replaced all my c425 cams with the v1.2, keep fingers crossed but since it does work. wifi connection also seems to have improved a lot. tp support staff ws reactive and supportive even though i had to put a lot of efffort in myself. thinking about not updating them anymore as they work now.