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Switching networks

Star I
Hi, I have problem with switching networks. Sometimes when I wake-up the phone, it shows that it is connected to E (2G). Phone after while switches to LTE (4G). Sometimes it is almost instantly a sometimes it takes a very very long time. When i then switch to use only 4G/5G manually, the phone connect to 4G instantly. Where can be the problem? Due to some network coverage at here I cant leave the setting to 4G/5G only all the time. My question is why the phone is dropping to 2G when the 4G is availible? And if this is normal behavior due to some battery save or anything else, why the switching to 4G after wake-up takes so long? Thanks (T-Mobile CZ)