Since about February i started having very poor mobile data reception when i'm at home. If i limit my phone to use only 2/3G it stays nearly full , but if i enable 2,3,4G then it will go up to 4G but only with 1 bar and internet is dead. As I get away further from the house the better the reception is.Also funnily enough , in my work office where historically I didn't have much reception unless i was close to the window , now i have nearly full reception. Alas , now i work from home and I would really like it to go back to how it was before. VM tech sent me a new SIM but doesn't seem to behave differently, they said they will call me back in a week but they haven't. Device is a OnePlus 7 and i made a note to keep in mind that this issue didn't happen after an OS upgrade and neither any upgrades aftwards fix it or made it worse.
Predominant band is 234 38 LTE B20 (806.00MHz) with the nearest tower approx 100m away. (taken from LTE Discovery app)
Any setting or tweak I can change to improve it ? I've tried SIM1 and SIM2 with SIM1 behaving worse (even got total loss)