Use this article if…
Use this if the MK4 usually boots to the home screen but then freezes, needs a key cycle, or reboots while you use it - often USB load, apps, or supply dips. Cold start that never leaves a black screen or logo is not this guide: use has power but won’t start, or won’t turn on if there is no sign of life at all.
Quick answer
Random reboots or freezes are often unstable supply voltage or a bad USB device. Unplug every USB accessory from the MK4 and check battery voltage under real load before looking for software causes.
Problem
- MK4 freezes, reboots randomly, or locks up until a key cycle.
Symptoms
- Screen locks up until you key cycle.
- Full reboot while driving or parked - returns to logo.
- Happens after opening one specific app or device.
Cause
- Brief battery or supply voltage dip resets the SoC on rough roads or heavy electrical load.
- A USB device or hub draws too much current or crashes USB stack enumeration.
- A buggy third‑party app or background service destabilises the system.
- Thermal protection or blocked cooling around the install causes throttling or shutdown.
Fix Step-by-step
- Remove all USB accessories - including hubs - and run the vehicle a day; reintroduce one at a time.
- Watch battery voltage during the behaviour (rough road, high load) per power troubleshooting.
- Uninstall or disable the last app installed before freezes began; boot to a simple home screen test.
- Ensure vents around the install aren’t fully blocked by gear.
- If tied to a specific official update file, stop and email PVS before re‑flashing.
Notes
- Never boots past logo: Has power, won’t start, Power / boot loop
- Harness: MK4 wiring
- USB load: unplug hubs before blaming software
- Stable boot: First-time setup
- Firmware: MK4 firmware & updates (PVS)
Firmware & updates (quick)
- Check build: About device screenshot before any flash - attach to support mail if freezes continue.
- When it’s relevant: Crashes persist with no USB devices and clean power - PVS may provide a fix build; follow USB update guide.
- Safe rules: PVS-only images; engine charging; one update, full completion.
- Stop - contact PVS: Freeze started right after unofficial copy or pull USB during update; escalating boot loop.