I use one of these dongles on a RaspberryPi. Once a day for about 1 minute I connect to the dongle, send about 100Kb of data and then disconnect.
However, at random times when NOT connected, I lose big chunks of data. For example over a 10minute, 500MB has disappeared. The Warehouse can not tell me where is goes.
I did quite a bit of searching hoping that I could change the WiFi Key on the dongle with no luck. Lots of information re changing WiFi user and WiFi passwords.
I did some reading about firewalls, but as the device is not even connected to the Pi at the time I wouldn't expect that to make any difference.
I also read somewhere that Huawei do not update the firmware on the device unless requested. This appears to be correct as there is a selection on the device's webpage for doing this ... and it is up to date.
Could anyone suggest where to investigate next?