I have been using my phone for about 3 years. It has become slower and slower. In the beginning, everything opens instantly. Now, it literally takes 10 seconds just to open Chrome. I quit all the applications after I am done with them. In that case, I don't understand. What is making my phone less responsive?(I tried to lookup, but all I got are some weird claims from some shady news websites about battery dying or system updates, which does not really make sense to me.)