we are testing some different Teltonika RUT240 LTE Routers since a few months (started in May 2021) because we plan to realize a project where many routers are necessary.
What we can see is, that during the test, sometime every device looses the mobile data connection and does not restart it until we do a manual reeboot.
-If the error occurs the data connection is kept in the disconnected state
-Every router has the firmware Version: RUT2XX_R_00.01.14
-SIM Card Status shows „Ready“ but no data connection is available
-Mobile signal strenght is fine RSRP -93dBm / RSRQ -7dB / SINR 25.7 / 4segments
-there is one planar antenna mounted
-APN is selected to „custom“ and parameters according to providers specification
-No data limit on the SIM card is active
-We tried also with different SIM cards from different providers, works fine over many days but sometime the disconnect state appears on one router, the others are still working on
-Next time any other router might be concerned
-We downloaded a „troubleshoot file log“ after „Data connection“ is pending disconnected which could be distributed
-We downloaded a second „troubleshoot file log“ after reboot while „Data connection“ is stable again
-Your workaround to avoid the error in the future might be an automatic reboot after a certain amount of ping attempts
-Is this the best way to handle or can any cause be established?
Thanks a lot for helpful answers.