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Yes. Intermittent phone reboots can absolutely be caused by faulty flex cables, especially if the reboot happens when the phone is tapped, moved, or pressed near a specific area. A damaged or loose flex can interrupt power or signal lines briefly, which is enough to trigger restarts.
Why it happens
Flex cables carry critical signals between parts like the charging port, screen, camera, buttons, and sensors. If the ribbon is torn, pinched, poorly seated, or corroded, the connection can become unstable and the phone may reboot unpredictably. In some cases, the fault looks like a battery or motherboard problem when the real issue is the flex cable.
Common clues
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Reboots happen when the phone is lightly shaken, tapped, or flexed.
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The problem started after a repair, drop, or water exposure.
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Other symptoms appear too, such as charging issues, screen glitches, or sensor failures.
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The reboot may stop temporarily when the cable is reseated or removed.
Most likely flex-related causes
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Torn ribbon traces.
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Loose or damaged connectors.
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Poor installation after repair.
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Corrosion from moisture damage.
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A charging-port flex that affects the phone’s power stability.
What to check first
A technician will usually inspect the flex cable, connector seating, and any nearby damage before blaming the motherboard. If the reboot started right after a screen, battery, camera, or charging-port repair, the flex cable is a strong suspect. Continuity testing can also help confirm whether the ribbon has an open trace.
Bottom line
Intermittent reboots can be caused by a faulty flex cable, and the evidence is strongest when the phone restarts with movement, after repair, or alongside other flex-related faults. If that pattern fits, the flex cable or its connector should be checked before replacing more expensive parts.
