in this log i can't see if it modded or not but it seems like you restart the server a time before sharing this log
and if it's modded it's normal for modded servers to stop suddenly Aternos assigned more ram than vannila for mods but mods has a lot of load
and to wait 30min it is normal because there is a load on starting servers
some times i wait 0.3sec at 8am in my country