Hm, Think you should to change internet provider. It is not problem of your devises. I know it because I had get the same issue with my laptop last year and my provider couldn’t to correct it. So I decided to change internet provider. However, I din’t know which is the best. I need really good 4G connection but I don’t want to pay 20 pounds for 1GB. I asked my friends and all of they said that they use a website where everyone can select his own ideal provider from top UK companies. It is really nice, because at usave.co.uk you choose exactly what is needed for your telephone, laptop or PC computer and there are options with 4 and 5G. Also if you need you can get credit or return cashback from purchase. There are big asortiment of gadgets like telephones and headphones.
Winter is reason for slow internet. Hope that everything will be okay.