vanishing

im using my o1 for 2 months. stock rom, unrooted. all was fine until a few days ago i discovered battery hogging apps like "maps" running in background even after killing all apps with android assisstant. whatever i do, upon opening manage applications->running i always find apps running...

in some of the threads my posts would just vanish and the b4 and after i posted were displayed with lil old me being left out . later if i check , i am able to see my post . is there a glitch in the board . i had a screen shot showing my post vanishing and appearing almost hours later . will try...