Find the real cause
Crash-heavy versions, paywall surprises, and broken login after an OS update show up in review text before they show up in a spreadsheet you like.
Segment by version. Averaging everything hides the release that needs a hotfix.
Prompting without looking desperate
Ask after a clear success moment, not at first launch. Never gate features behind a star tap — Apple and users both notice.
Reply to concrete complaints with a fix path. Generic “please contact support” reads as avoidance.
Watch peers too
If rivals hold 4.7 while you slide to 4.1, category browsers feel that gap. Schedule iOS audits so rating velocity is visible next to competitor listings.