Pair once with the car parked and note when the entry disappears: after shutdown, after another phone connects or after a phone update. The timing identifies the likely side.
Use normal shutdown procedures, keep hardware dry and stop if you see damage, overheating, burning smells or any electrical risk.
Checks to perform in the right order
Confirm the exact symptom
Check whether the vehicle memory is full or contains duplicate phone entries.
Start with the simplest reversible check
Remove one obsolete pairing and create a clean connection without changing several phone settings together.
Change one variable at a time
Compare a second phone and record whether the vehicle forgets every device or only one.
Cross-test before resetting anything
Write down what changes and what stays the same. A controlled comparison is more useful than several resets performed together.
Escalate with useful evidence
If the problem survives the safe checks, record the model, software version, warning shown and tests already performed before contacting support.
How to narrow down the cause
- A change after one controlled test is a useful clue; keep the other variables unchanged.
- If a second compatible device works in the same setup, focus on the first device rather than replacing everything.
- Stop if there is heat, liquid, physical damage, burning smell or electrical risk.
Official sources used
Procedures can vary by model, firmware or hardware revision. When your device differs, use the official manufacturer documentation for that exact model.