Problem whith mobile internet on alldocube m8

Hello, I got a problem with mobile Internet on the tablet alldocube m8. When I connect to the mobile Internet, the data is transferred with freezing. I open some website or application and at the beginning the data is downloaded normally, then for 3-5 minutes there is a stop, the data stop loading. But if I install the same SIM card in my old tablet (alldocube t8 plus), the Internet starts to work on it normally. I tried to install two types of firmware (with Google services and without them), installed the update, but it does not help

What your tablet problem is  it will be cut off when the data is downloaded.?Will it happen when browsing the web or watching the web video?