Same issue here with my 522GW.
If the "speed indicator" screen saver is enabled then quite often it'll be stuck on 0mph.
"blank" screen saver may stay on a blank screen.
Alternatively it may be showing a live (and moving) video display, but is not recording and doesn't respond to button presses other than 15 seconds on the power button to force a shutdown.
I've just brought the unit and card in to retrieve some footage, turns out it's not been recording since the 30th of January. As usual the last recording was from when the car was parked up, so hardly hammering the SD card.
Cam: 522GW plus rear ball cam
Firmware: R16.3
Video setting: 1440p front, 720p rear, 3 minute length (1 minute setting has the same issue)
Audio: on
Alerts: off
Parking mode: on
Auto Power Off: on
SOS: not configured
Power: hardwire kit, permanent feed (internal battery only lasts about a minute so no point going for the ignition-switched feed)
Card: SanDisk Extreme 128GB SDXC V30 U3 A2 (bought from MyMemory and checked today with H2testw)
Format: exFAT (done by the cam)
As an aside, here's why you should format the card in the cam, or at least not in Windows.
Formatted in Windows 10:-
Code:
Warning: Only 121909 of 121910 MByte tested.
Test finished without errors.
You can now delete the test files *.h2w or verify them again.
Writing speed: 9.35 MByte/s
Reading speed: 80.7 MByte/s
H2testw v1.4
Formatted with Tuxera SD Card Formatter 5.0.1 (from the SD Association website):-
Code:
Warning: Only 121909 of 121910 MByte tested.
Test finished without errors.
You can now delete the test files *.h2w or verify them again.
Writing speed: 73.5 MByte/s
Reading speed: 80.9 MByte/s
H2testw v1.4