Old user but now facing critical issue with my iphone

i am old user of iPhone but now these days some time i am facing some problem with my iphone. when i open my browser and open facebook & Techriation same time browser stop working and closed. i tryed many tricks like

1. Delete Caches and test.

Close all windows and quit all applications.

Hold "option" key down and click "Go" menu in the Finder menu bar.

Select "Library" from the dropdown.

Library > Caches > com.apple.Safari

Right click the com.apple.Safari file and select "Move To Trash.

Close windows and relaunch Safari.

but still same issue. plz resolved this issue and oblige.