After “updating” my iPad to iOS 17.4.1, it performed normally. After being out of town a five hour drive away with minimal iPad use (most of the time in airplane mode), the iPad had all kinds of strange things going on after returning home; calendar was completely cleaned out, safari bookmarks were gone, email & text history missing, etc. While searching for fixes, found the “turn it off and back on” recommendation. After doing that, everything on the iPad was normal. Love it when the solution is simple.