My brand new S20 Ultra becomes unreachable many times during the day.How can I fix this network problem?

whats new with the update that I just downloaded?

why does my S8 lose charge so fast. My S7 Edge was perfect.

i took a few pictures on the beach, sea water slightly reached the phone and the phone would not charge by USB for 4 days.Now after 10 days of the incident the phone charges but not all the time. it suddenly loses connectivity to the charger.the phon...