I realized that the connection is discontinuous because my home automation system signals it going offline (it's conneced via eth port).
It happens at the same time when the ping 188.8.131.52 -t signals packets loss (between 20% and 25%).
I'm sure it depends by the Archer MR200 because if I put the same SIM card in another 4G router (with the same eth cable) all the connected devices work fine
and even the continuos ping doesn't report packets loss.
I also tried to connect the home automation system to another eht post, but nothing change
There's no connection problem between the home automation system and Archer MR200 because I can ping it frm the LAN continuosly without packets loss, even when the 4g connection problem.
The firmware is the last available.
However, regardless of the connectivity problems of the home automation system, when I use the same sim card on another 4G router I have no loss of packets or other problems.
What kind of log or other information I should looking for to verify the 4G connection stability?