@Fikotr74 

Hi,
The Cell Lock feature allows the router to connect to a specific cellular cell by the Cell ID. When the router's network mode is set to "4G Preferred," it prioritizes connecting to the 4G LTE network. However, enabling the Cell Lock feature does not guarantee that the router will remain exclusively on the 4G network; for example, if the base station actively terminates the connection, or the 4G network drops due to poor signal strength, the router will automatically switch to a 3G signal.

Based on the phenomenon you have reported, the 4G signal from Cell ID (CID) A85515 may be unstable. You could try repositioning the router to obtain a stronger 4G signal, or alternatively, disable the Cell Lock feature to allow the router to connect to 4G signals from other cells.

Best Regards