iPhone Keeps Shutting Down Every Few Minutes?

iPhone keeps shutting down every few minutes is a power-path / connector ticket more often than a cursed logic board — especially on iPhone 14 and newer that already visited a bench.

Related: stuck on Apple logo · charge port cleaning · not charging · Face ID after repair.

History decides the first screw

History	First suspect (iPhone 14 and newer)	Why
Screen already replaced	Proximity sensor flex	Torn, pinched, or badly transferred during the glass job
Back glass / rear already opened	Rear flexes (incl. wireless coil / related lines)	Pinch under new glass
No open history	Proximity sensor flex, then charge port, Taptic/vibrator, button flex	Proximity still leads; then bottom / button paths
Liquid	Corrosion on any of the above	Clean + rebuild

This matches what working shops see daily: stop jumping to “IC fault” before the flex map.

Soft pass (do once)

1. Note battery % when it dies (sudden at 40% ≠ graceful shutdown)
2. Update iOS
3. Check Analytics for panic logs if you read them
4. Remove thick cases / MagSafe accessories for a test day

If shutdowns began the afternoon of a screen install, skip three days of Settings — reopen and inspect the proximity sensor flex, not only the big display connectors.

Flex map (shop)

Use controlled open tools: separator + precision screwdriver set. Battery disconnect per SOP.

A) Proximity sensor flex (prior screen replacement)

On iPhone 14 and newer, post-screen reboot loops often track the proximity sensor flex — the small cable disturbed (or poorly transferred) when the display comes off — more than a generic “display connector not clicked.”

Check:

• Proximity flex transferred intact (not torn at the bend)
• Correct routing / no pinch under the earpiece / sensor bracket
• Connector fully seated on the board side
• No folded pins from a rushed aftermarket install
• Donor / known-good proximity flex if the original was damaged during the swap

Also confirm the main display FPCs are seated — but if the history is “screen replaced → reboots every few minutes,” start with the proximity flex.

B) Rear / back-glass path (prior rear open)

• Inspect wireless coil flex and any rear interconnects disturbed during glass
• Look for crushed cable under adhesive
• Refit with correct cable channels — not stretched diagonals

C) No prior open — proximity first, then bottom / buttons / Taptic

In order of frequency for “mystery reboot” with clean software:

1. Proximity sensor flex (seating, damage, donor flex test)
2. Charge port flex (also clean lint — port cleaning)
3. Taptic Engine / vibrator connector
4. Power / volume button flex

Wiggle tests and known-good donor flexes beat guesswork soldering.

What it is usually NOT (first visit)

• Brand-new battery “because % looks low” while a proximity flex is pinched
• Full board swap without a donor flex test
• “iCloud glitch” when deaths started at the repair counter

Customer wording

“On iPhone 14 and newer, we check the proximity sensor flex first — especially after a screen job, and still first even with no prior open. If the back was opened, we check rear flexes next — then charge-port, Taptic, and button flexes.”

Bottom line

Proximity sensor flex first → rear flex if back was opened → then charge port / Taptic / buttons. Reseat or replace the right flex before you replace the phone.