4G network problem

[ienfik]

Hello

I bought second hand Lumia 950 XL RM1085_13829 I did upgrade (OTA) to 10586.164 i FW 16025.39013
When I left from myhome and wifi signal I lost connection to world. Lumia struggled to keep 2G/Edge signal in places where I hadn't any problem

I did reset to factory settings - problem exist At lunch time I used windows device recovery tool and I installed fresh system Problem still exist

In evening I went to my provider EE and they swapped sim card to new one In first half an hour phone works fine with 4G network and later again switch to 2G/Edge network or showed no network

Have you got any idea where is problem?

Thank you for any advices

PS
When I select manual "hang up" network Lumia displays EE is available in my area with 2G/3G/4G network

 

[miodrage]

Possibly some hardware defect with the SIM slot. when you cool it down, it works, then when gets heated up, from use, no network. try to put the phone in the freezer immediately when problem start, then take it out in 10 mins, and see if it helps. If it does, then u have to swap the SIM slot or the network chip (I ain't a tech savy)

 

[ienfik]

Thank you for interesting advice I'll try it and Let you know