Battery drain Galaxy S9 iodé 3.5

So I experience a heavy battery drain on My S9.
When I look into the battery activity it shows that „Mobile network“ uses most of it and drains even when I’m not actively using the phone.

Is this a known issue and is there a simple solution?
I tired installing iodé 2.10 but I didn’t get it to run :frowning:

Thanks in advance!