TL-MR6400: SIM Card Not found
I purchased a TL-MR6400 router about a year ago. I'm using it as a 4G router. It's been working fine and made me very happy.
Since a week, it has started to repeatedly loose connection. On web UI, in the status page, I'm getting a "SIM Card not found" message.
If I reboot the device without touching it - using web UI - and without touching the SIM card inside, everything goes back to normal for a random period of time.
It might work 5 minutes or 3 hours, but in the end, it will eventually go back to the «SIM Card not found" status.
I don't believe SIM card is to blame, it's only 3-month-old.
What I tried:
- System update
- Factory reset
- Remove SIM card & clean SIM card
- Clean SIM card tray
- Unplug and wait before reboot
All those actions had literally no impact on the frequency of the connection loss.
What can I try to fix this, it is really annoying has I intend to use it for professional purposes?