Hi!
Thank you for your reply.
It seems to really go wrong when switching networks indeed. Last few times I have had some succes with the following: when arriving at the train station I start up the Surface 3 and see it connect to HSPA+. Then there seems to be no issue and I have internet.
If I get on the train then and start moving it seems to go wrong. Probably because the HSPA+ coverage is not sufficient and it doesn't switch, no it tries to stay connected to HSPA+. If I then disconnect it only disconnects the current data flow, but it stays
connected to the network indicating "HSPA+" That's why I am then also unable to reconnect and have it search for the best connection.
However, if I use a different scenario: arrive at the train station, startup Surface 3, see it get connected to HSPA+, have internet and all and then disconnect and wait a while I am able to reconnect and it gets connected to LTE. Then I see that I have LTE the whole train ride and the connection is 100% stable. I should not try to reconnect too fast, because it starts complaining about the APN not being correct. For the time being, that seems to be the only way to force the Surface 3 to look
for a better connection.
I really wonder if this is better in a Dell Venue Pro for example (since they have different WWAN cards). And I hope that at some point Samsung will come with a nice Surface 3 like device with LTE. The Tab Pro S is really looking good when it comes to that,
but I think it is too large and it doesn't have LTE.
Regards,
Rudi