Problem Galaxy S20 problems



I have a Galaxy S20 5G and it seems to have some problems, I would like to know if you have also encountered it and how you solved it.
The phone seems to have "lag in the network". Many times I enter an application and "no internet connection" appears. He recovers after a few seconds. Today, however, the situation worsened. Someone called me and the robot answered saying that the phone was off, while I had the phone on the table, turned on. Suggestions?

Another problem is battery consumption. This phone sucks the battery beyond measure. In the car, if I put Waze on, it doesn't face the cigarette lighter charger. Do you have a trick to optimize battery consumption?

Thank you have a good evening!