5G Home Broadband router keep selecting a mast far away from my home

[metoo6000]

Hello,

I got a 5G Home Broadband one month ago, and I had an excellent reception for the first week - DN over 500 Mbps, UP over 70Mbps. But, the speed started dropping significantly (DN: ~ 100 Mbps, UP: ~5 Mbps) and frequently disconnected more than five times per day. So, I have to restart manually; otherwise, I should wait more than 10 minutes to reconnect. I contacted the Three tech team more than four times but couldn't solve the issue.  

Now, I realise that the router is connecting to some masts around 4 miles away even though there is a mast within 0.2 miles near my home. I understand we can't select a specific mast, but I wonder why my router always connects to the far-away ones. These masts, including the one closest to me, have Band 1,3,20,28. So, I also manually selected the bands 1,3,20 and N78. But my router is still connecting to the far-away ones. 

Does anyone know how to solve this problem?

Thanks in advance. 

[metoo6000]

Hi guys, 

I am sure I was connected to the mast near my home when I first signed the 5G Home Broadband. I checked the mast from the cellmapper.net, and the mast was last seen on 23rd September 2023, which is around when I first saw some notices from the Three Network Status page and my connection speed was significantly reduced and disconnected very often. I called the Three Tech team and asked to check if the mast was live, and they confirmed it was live and 5G capable. But, then, why my router does not connect to that mast? Is there any way I can check if the mast is live?