Today after leaving home by taxi I decided to find out when my laptop would lose connection to my phone's hotspot and was very surprised. It looked like my laptop way staying connected despite the further I travelled . First disconnection I saw when I passed 200 meters from home. After that I got my laptop reconnected back to hotspot for few-second-sessions.
I have attached the screenshot of the tethering settings page, about 4-5 minutes since I left home. That time I was about 3 km away from home, that was at least 5th session, and the last one.
After that screenshot my laptop finally disconnected until I got back home. Phone: Huawei P9 Lite (not rooted), laptop: Vaio VPC.
What that was?