HERE maps will not start

Question

Hello,
I have a Nokia Lumia 620 with firmware 1030.6407.1308.0001.
Yesterday, I wanted to check traffic status before leaving home. While HERE Maps was working on WiFi at home, I locked the screen, took the elevator to go downstairs (no connection in the elevator). I went out and unlocked screen (on EDGE network), Here Maps was frozen. I could not quit the application, so clicked widows button to go to main screen. Afterwards,even after a phone reboot, HERE Maps and Drive do not start. Both programs quit after showing splash screen, returning to home screen, where I start them. Same with HERE City lens and Transit. Even settings do not start. I can go to Settings->Applications->maps, but "download maps" or "check for updates" exit immediately back to "applications" level. "delete history" seems to delete but does not help.
I have downloaded and used Lumia Storage Check Beta to download maps to SD card when it was updated at the end of April. It worked fine till yesterday and I am not sure if the problem is related to that.
I have not tried removing SD card, uninstalling programs or resetting the phone. These options seemed too harsh.
Hoping for your support,
Özgür
Solved!
Go to Solution.

Answer 1

It looks like the problem is with SD mini card or WP8 card management. I was using a 64 GB SD Card I bought for my Lumia 620. Info about the card is below.
Writing speed: 5.39 MByte/s
Reading speed: 11.1 MByte/s
File system: exFAT
The card worked for around 2 weeks, Lumia 620 used a map file on it, saved photos, played music, etc.
Yesterday (after HERE Maps stopped working) when I removed the card from Lumia 620 and inserted to my computer, it first wanted to correct errors, then asked me to format it. After formatting, I once more formatted on Lumia and tried to download map. It crashed several times and I had to format it each time on my computer (and as precaution I formatted each time on the phone). I even once (not quick) formatted the card on my PC, but it did not help.
Now I am checking the card on my computer for errors with a speed test program (H2testw v1.4).
At the moment, I am using an older 8 GB SD mini card on my phone. I have just downloaded a map and I will add music, take pictures, etc. 64 GB card also worked for 2 weeks, so this card's working status for now, does not prove anything.
8 GB SD mini info:
Writing speed: 5.00 MByte/s
Reading speed: 14.4 MByte/s
File system:FAT32
Another difference between 2 cards is, 8 GB is FAT32 formatted, while 64 GB is exFAT.
I will post updates.
Özgür