Omi Funk ZV does not work

Hello, just 2 weeks ago I became proud owner of an Omega 2.0 16 V BJ 7/98 and now have the following problem. When I wanted to lock the car by radio nothing happened anymore. I tried it a few times, once I could open it and now there is nothing more. By hand everything works as it should. I think it’s not because of the batteries because it would have to be very stupid coincidence if both key batteries should be empty at the same time. What for an average consumption you have to reckon with (real). Please no hero answers 1.5 liters to 100 km and so I want real average values when it works. Who knows rat ??