Hi,

I manage three 4G modem/routers by means of Tether app (2 TL-MR6400 and a TL-MR105). 2 of them are always available, while the third one (a TL-MR6400) is often reported as "Offline". the device is always connected to Internet with no problems and the firmware is the latest. The 2 MR6400 are both running latest firmware.

This is very annoying and I don't understand why one MR6400 is always available, while the other one very rarely.