Hi,

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?

Kind Regard,

Thibaut