I’ have plenty of storage avail., have rebooted my 6S plus multiple times & restored. My screen freezes in favorites list & contacts so am unable to make calls. Apple store replaced my 6S plus battery under the $29 program 2 wks ago (I had iOS 9.3.5 & didn’t want to upgrade). Unfort. days later I found out they damaged my receiver speaker so had to go back to the store & they had to replace my screen (n/c but they don’t cover cost of your new screen protector). They neglected to tell me they had to install iOS 11.2.6. Here I am again w/my 3rd problem in 2.5 wks. & wish I had never replaced my battery. I’ve now spent over $75, have less storage due to the iOS upgrade & now my phone has more probs than I had before. UGH.