Dear Comunity,
I am having the exact same issues described in [post|243987] thread for the regular z3. The suggested solution is to replace the antenna board.
I cannot, however, find said article for my version of the phone and am a bit lost as to what I can do. The two phones probably do not have the same hardware, right?! Do you think it would be a possible solution to try and only exchange the antenna cable? This one can be found for the d5803.
Thanks,