I've got Three's HomeFi 4G home broadband product which came with a Huawei B311 router...had it running for a few months and it was great, 50meg down, 30 up, as opposed to the 15 down and 1 up that I was getting with Openreach based FTTC due to the cabinet being so far, ally cable, SCP, etc.
It's all gone wrong in the past 3 weeks, my phone keeps reverting to 4G rather than the WiFi, my work laptop won't connect to the VPN at all, and my own computer keeps sticking on 'Resolving host' for a good 5 seconds before loading a webpage. I've tried setting different DNS servers to no avail. It seems like as soon as it resolves the host it goes to being properly fast again hence still getting a decent speedtest result.
Spoken to Three's technical support tonight, who reckon it's a known issue with Huawei and they're in the process of testing a firmware update which should be ready in the next 2-3 weeks! Has anyone else had similar trouble as it sounds a bit bullshitty to me. For what its worth, I've got line of sight to the 4G mast, and my phone also uses Three 4G without any issues at all.