EC25-AU unexpected baudrate change

We have problems with EC-25 modems. The modem was initially configured with a 9600 baudrate and work for a few days. Then unexpectedly the device don’t work anymore. Cheking for the baudrate of the modem we found that has changed to 115200. This error has been found in multiples devices.
There is some reason for this unexpected change?

Hello, we have not encountered such a situation as you mentioned, but have you ever tried to use 115200 baud rate directly and there will be any problems?
Have a good day.